21-25 May 2018

Bonn

Europe/Berlin timezone

- theory@physik.uni-bonn.de

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## Contribution List

Displaying 134
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134

Considering NLSUSY-structure of space-time just inspired by nonlinear representation of SUSY(NLSUSY) and performing the ordinary geometric arguments of Einstein general relativity(GR) principle, we obtain NLSUSY invariant Einstein-Hilbert-type general relativity action(nonlinear supersymmetric general relativity (NLSUSYGR)) equipped with the cosmological term of the robust SUSY breaking encoded in
... More

Presented by Prof. Kazunari SHIMA
on
24 May 2018
at
4:50 PM

Session:
Plenary Session

String theory suggests the existence of multiple axion-like particles (ALPs) as well as hidden sector gauge bosons. Some of those ALPs and hidden U(1) gauge bosons (dark photons) might be light enough to result in interesting astrophysical and/or cosmological consequences. As an example of such possibility, we examine ALP-driven late time magnetogenesis generating the cosmic magnetic field via the
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Presented by Kiwoon CHOI
on
21 May 2018
at
11:00 AM

Session:
Parallel Session on Axion-DM

In Peccei-Quinn (PQ) solutions to the strong CP problem, a global $U(1)_{PQ}$ symmetry is typically added by hand. However, $U(1)_{PQ}$ need not be exact: it may arise from discrete symmetry, provided the PQ solution is protected to sufficient order. We present a rather complete model, based on Pati-Salam unification and $A_4$, wherein such discrete symmetries are the very same symmetries that gov
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Presented by Fredrik BJÖRKEROTH
on
23 May 2018
at
3:20 PM

Session:
Parallel Session Formal

It has been recently argued that the presence of any non-SUSY AdS stable vacua implies that a theory can not be consistently coupled to gravity (Ooguri-Vafa conjecture). In particular, this can be applied to the SM and its compactifications to 3 or 2 dimensions to obtain predictions on low energy physics. We will review some implications from these compactifications in general and present in detai
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Presented by Alvaro HERRAEZ
on
23 May 2018
at
3:00 PM

Session:
Parallel Session on Flavor and EFTs

Beside neutrino masses, an assortment of precision observables probe new physics in the lepton sector. Experimental anomalies include a 3.5-sigma discrepancy in the anomalous magnetic moment of the muon and a 4-sigma indication of lepton universality violation in B-meson semi-leptonic decays. Effective field theory is a useful framework for studying observables sensitive to multi-TeV scales in a m
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Presented by Rupert COY
on
23 May 2018
at
4:10 PM

Session:
Plenary Session

While the LHC has done an excellent job of looking for new physics in all the expected places using simplified models, so far much less attention has been paid to model-independent, data-driven approaches. I will review a recently proposed method of "rectangular aggregations" that can find potentially interesting excesses in existing LHC searches without relying on simplified models. As a proof of
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Presented by David SHIH
on
21 May 2018
at
12:00 PM

I will discuss the asymptotic-safety paradigm as a framework for model of quantum gravity and matter at and beyond the Planck scale. I will highlight indications for the theoretical viability of this scenario and discuss how in this setting, Planck-scale physics could lead to testable consequences at the electroweak scale. In particular, the asymptotic-safety paradigm could have a higher predictiv
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Presented by Astrid EICHHORN
on
24 May 2018
at
2:00 PM

Session:
Parallel Session Formal

We use Pauli-Villars regularization to evaluate the conformal and chiral anomalies in the effective field theories from Z3 and Z7 compactifications of the heterotic string without Wilson lines. We show that parameters for Pauli-Villars chiral multiplets can be chosen in such a way that the anomaly is universal in the sense that its coefficient depends only on a single holomorphic function of the t
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Presented by Jacob LEEDOM
on
23 May 2018
at
2:40 PM

Session:
Parallel Session on Composite Higgs

Twin Higgs (TH) models explain the absence of new colored particles responsible for natural electroweak symmetry breaking. All known ultraviolet completions of TH models require some non-perturbative dynamics below the Planck scale. A new type of supersymmetric Twin Higgs model is presented in which the TH mechanism is introduced by a new asymptotically free gauge symmetry. The model features natu
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Presented by Marcin BADZIAK
on
22 May 2018
at
3:50 PM

Session:
Parallel Session on Unified Models

Non-supersymmetric Grand Unified SO(10) × U(1)PQ models have all the ingredients to solve several fundamental problems of particle physics and cosmology — neutrino masses and mixing, baryogenesis, the non-observation of strong CP violation, dark matter, inflation — in one stroke. The axion — the pseudo Nambu-Goldstone boson arising from the spontaneous breaking of the U(1)PQ Peccei-Quinn sy
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Presented by Anne ERNST
on
24 May 2018
at
2:00 PM

We propose a ``Light Shining Through Walls"-type experiment to search for axions with high-$Q$ superconducting RF cavities. Our setup uses a gapped toroid to confine a static magnetic field, with production and detection cavities positioned in regions of vanishing external field. We argue that the confining toroid does not significantly screen the axion-induced signal for frequencies of order the
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Presented by Vijay NARAYAN
on
22 May 2018
at
2:20 PM

Session:
Parallel Session on Axion-DM

The axion solution to the strong CP problem also provides a natural dark matter candidate. If the PQ symmetry has ever been restored after inflation, topological defects of the axion field would have formed and produced relic axions, whose abundance is in principle calculable. Using numerical simulations I will present a detailed study of the evolution of axion strings and the resulting spectrum o
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Presented by Marco GORGHETTO
on
23 May 2018
at
2:20 PM

Session:
Parallel Session on Axion-DM

I will present QCD axion or cosmological Goldstone bosons, such as ultra-light dark matter or quintessence, in a model with global symmetry highly protected by gauge symmetries. The global symmetry is accidental, obtained from an abelian quiver with scalar bifundamental fields. The Goldstone boson mass may receive explicit breaking contributions, but these are already much suppressed for a few qui
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Presented by Quentin BONNEFOY
on
23 May 2018
at
2:40 PM

Chiral electroweak anomalies predict fermion interactions that violate baryon (B) and lepton number (L), and can be dressed with large numbers of Higgs and gauge bosons. The estimation of the total B+L violating rate from an initial two-particle state --potentially observable at colliders-- has been the subject of an intense discussion, mainly centered on the resummation of boson emission, which i
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Presented by Carlos TAMARIT

Chiral electroweak anomalies predict fermion interactions that violate baryon (B) and lepton number (L), and can be dressed with large numbers of Higgs and gauge bosons. The estimation of the total B+L violating rate from an initial two-particle state --potentially observable at colliders-- has been the subject of an intense discussion, mainly centered on the resummation of boson emission, which i
... More

Presented by Carlos TAMARIT
on
22 May 2018
at
2:40 PM

Session:
Parallel Session on Astro-DM I

We study constraints from Big Bang Nucleosynthesis on inert particles in a dark sector which contribute to the Hubble rate and therefore change the predictions of the primordial nuclear abundances. We pay special attention to the case of MeV-scale particles decaying into dark radiation, which are neither fully relativistic nor non-relativistic during all temperatures relevant to Big Bang Nucleosyn
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Presented by Marco HUFNAGEL
on
23 May 2018
at
4:30 PM

Dynamical relaxation in an interesting framework in which the scale of new physics is pushed far beyond the observable range without abandoning the principles of naturalness. A low value of the electroweak scale originates from a dynamical selection process that comes from an interaction between the Higgs boson and an axion-like particle (a relaxion). During the relaxation, the relaxion rolls down
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Presented by Adam MARKIEWICZ
on
23 May 2018
at
4:50 PM

One of the key motivations for supersymmetric (SUSY) models is their ability to naturally stabilize the electroweak scale and so address the hierarchy problem. However, in the Minimal Supersymmetric Standard Model (MSSM) accommodating a 125 GeV Higgs boson appears to once again require a degree of fine-tuning. This has fueled interest in non-minimal SUSY models, such as the Next-to-MSSM (NMSSM), t
... More

Presented by Dylan HARRIES
on
24 May 2018
at
5:10 PM

Session:
Review Talk

Recently, machine learning techniques have entered the field of string phenomenology, for example, in order to identify promising string models in the vast landscape of string theory vacua. We review different approaches and techniques, like 'Autoencoders', 'Reinforcement Learning' and 'Generative Adversarial Networks' and apply them to several physical questions.

Presented by Mr. Patrick VAUDREVANGE
on
24 May 2018
at
9:00 AM

Session:
Parallel Session on Astro-DM I

The latest Planck CMB data seem to strongly constrain the Hot Dark Matter scenarios, although they stay in tension with direct Hubble constant measurements. One can expect that in near future the experimental uncertainly for the effective number of neutrino species N_{eff} will shrink vastly. Therefore, in order to estimate the allowed parameter space of models predicting a Hot Dark Matter compone
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Presented by Paweł SZCZERBIAK
on
23 May 2018
at
4:50 PM

Many models of Beyond the Standard Model physics contain particles that are charged under both Standard Model and Hidden Valley gauge groups, yet very little effort has been put into establishing their experimental signatures. We provide a general overview of the collider phenomenology of spin 0 or 1/2 mediators with non-trivial gauge numbers under both the Standard Model and a single new confinin
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Presented by Hugues BEAUCHESNE
on
23 May 2018
at
3:00 PM

Session:
Parallel Session on Axion-DM

A massless quark solution to the Strong CP problem is implemented with an extra confining gauge group that is unified with the SM QCD group in a CUT (Colour Unified Theory). A novel contribution to the axion mass (due to the small-size instantons at the CUT breaking scale) renders the dynamical axion heavy. This allows to protect the PQ symmetry from semi-classical gravitational effects that could
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Presented by Pablo QUÍLEZ LASANTA
on
23 May 2018
at
3:00 PM

Many Standard Model extensions that address the hierarchy problem contain Dirac-fermion partners of the top quark, which are typically expected around the TeV scale. Searches for these vector-like quarks mostly focus on their decay into electroweak gauge bosons or Higgs plus a standard model quark. In this talk, backed by models of composite Higgs, we propose a set of simplified scenarios that inc
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Presented by Dr. Thomas FLACKE
on
23 May 2018
at
5:10 PM

Session:
Plenary Session

We consider a composite model where both the Higgs and a complex scalar χ, which is the dark matter (DM) candidate, arise as light pseudo Nambu-Goldstone bosons (pNGBs) from a strongly coupled sector with TeV scale confinement.

Presented by Andreas WEILER
on
21 May 2018
at
3:30 PM

Session:
Parallel Session on Composite Higgs

Composite Higgs models are among the most promising alternatives to solve the hierarchy problem and provide a dynamical mechanism to break the electroweak symmetry. In this talk I will discuss some predictions of specific UV realizations of such scenario. I will analyze in particular the phenomenology of vector and scalar states in a SU(4)/Sp(4) symmetry breaking pattern, using lattice results as
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Presented by Dr. Diogo BUARQUE FRANZOSI
on
22 May 2018
at
4:10 PM

A light bosonic field mediates a long-range "fifth" force between objects. If the field has self-interactions, experimental constraints on such forces are weakened due to a screening effect. We study how technically natural values for self-interaction terms in the field's potential lead to modification of existing constraints. We show that under this assumption of natural self-interactions, existi
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Presented by Sebastian ELLIS

We investigate the bounds which can be placed on generic new-physics contributions to dijet production at the LHC using the framework of the Standard Model Effective Field Theory, deriving the first consistently-treated EFT bounds from non-resonant high-energy data. In order to reach consistent, model-independent EFT conclusions, it is necessary truncate the EFT effects consistently at the first n
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Presented by Stefan ALTE
on
22 May 2018
at
4:10 PM

Since the LHC has not provided us with any hints towards new physics, it is ever more interesting to constrain BSM theories from purely theoretical considerations. Requiring that the electroweak vacuum in any BSM model is at least metastable, can lead to stringent constraints on the parameter space of the model. Many popular extensions of the SM, such as supersymmetry, feature greatly extended sca
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Presented by Mr. Jonas WITTBRODT
on
24 May 2018
at
4:30 PM

We demonstrate that rotational superradiance can be efficient in millisecond pulsars. Measurements from the two fastest known pulsars PSR J1748-2446ad and PSR B1937+21 can place bounds on bosons with masses below 10^-11 eV. The bounds are maximally good at masses corresponding to the rotation rate of the star, where scalar interactions that mediate forces ∼ 10^7 times weaker than gravity are rul
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Presented by Paul RIGGINS
on
22 May 2018
at
3:50 PM

The relaxion models propose a new idea to explain the smallness of the Higgs mass. They rely on the scanning of the Higgs mass parameter by a new field, the relaxion, and a back-reaction mechanism that is triggered when Higgs vacuum expectation value has reached the size of the electroweak scale, making the relaxion evolution cease. In the usual relaxion model the scanning happens during an inflat
... More

Presented by Nayara FONSECA
on
23 May 2018
at
4:10 PM

Session:
Parallel Session on Astro-DM I

We investigate dark matter (DM) production in an early matter dominated era where a heavy long-lived particle decays to radiation and DM. In addition to DM annihilation into and thermal DM production from radiation, we include direct DM production from the decay of the long-lived particle.

Presented by Mr. Fazlollah HAJKARIM
on
23 May 2018
at
5:10 PM

Session:
Plenary Session

Weakly Interacting Massive Particles (WIMPs) have been the target of
cosmic ray experiments for decades. AMS-02 is the first experiment which can
realistically probe WIMP annihilation signals in the antiproton channel. Due to
the tiny experimental errors, uncertainties in the astrophysical background
have become the most limiting factor for the dark matter detection. I will use
the combinatio
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Presented by Dr. Martin WINKLER
on
25 May 2018
at
11:30 AM

Session:
Parallel Session on DM

We study simplified models of top-flavoured dark matter in the framework of Dark Minimal Flavour Violation. In this setup the coupling of the dark matter flavour triplet to SM quark triplets constitutes the only new source of flavour and CP violation. The parameter space of the model is restricted by LHC searches with missing energy final states, by neutral meson mixing data, by the observed dark
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Presented by Simon KAST
on
24 May 2018
at
3:20 PM

Session:
Parallel Session on DM

The strong direct detection limits indicate that dark matter may not directly couple to quarks and consequently direct detection only occur at loop level. We study direct detection in the prototype example of an electroweak singlet dark matter fermion coupled to an extended dark sector composed of a new fermion and a new scalar. We also discuss the cases if either the new fermion or scalar is a SM
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Presented by Michael SCHMIDT
on
24 May 2018
at
2:00 PM

Session:
Parallel Session on DM

Due to its highly suppressed cross section (fermionic) dark matter interacting with the Standard Model via pseudoscalar mediators is expected to be essentially unobservable in direct detection experiments. We consider both a simplified model and a more realistic model based on an extended two Higgs doublet model and compute the leading one-loop contribution to the effective dark matter- nucleon in
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Presented by Stefan VOGL
on
24 May 2018
at
2:20 PM

Session:
Plenary Session

The cosmological standard model, LCDM, provides a very good overall fit to the precision cosmological data from the CMB, its polarization, baryon acoustic oscillations, measurements of large scale structure, and the current expansion rate of the universe. The most significant tension in the fit is associated with two quantities: the current expansion rate, H_0, and the amplitude of the matter powe
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Presented by Martin SCHMALTZ
on
21 May 2018
at
10:00 AM

We perform a precise calculation of the decay rate of the electroweak vacuum in the standard model as well as in models beyond the standard model. We use a recently developed technique to calculate the decay rate of a false vacuum, which provides a gauge invariant calculation of the decay rate at the one-loop level. We give a prescription to take into account the zero modes in association with tra
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Presented by So CHIGUSA
on
24 May 2018
at
4:10 PM

Session:
Plenary Session

Several intriguing deviations from Standard Model expectations have been observed in flavor-violating processes in the last few years, most notably hints for violation of lepton flavor universality, both in neutral-current B meson decays involving light leptons and in charged-current B meson decays involving tau leptons. I will give an overview of the status of these deviations and discuss possibl
... More

Presented by Dr. David STRAUB
on
23 May 2018
at
11:00 AM

The Weinberg operator allows for the construction of radiative Majorana neutrino masses. In this letter, it will be shown that it is possible to construct a one-loop diagram that will be the principal component of the neutrino mass matrix and that will have an exact mixing matrix with θ13=0. The addition of a two-loop diagram, which is naturally suppressed, allows the creation of the correct pert
... More

Presented by Daniel WEGMAN
on
24 May 2018
at
3:20 PM

In the absence of new particles at the LHC, the effective field theory framework is appropriated to look for small deviations from the Standard Model (SM). In this case, the leading effect is encoded on the interference term between the SM and dimension-6 operators. However, at the high energy limit due to helicity selection rules, this term, for some operators, is suppressed which leads to an obs
... More

Presented by Rafael AOUDE
on
23 May 2018
at
3:20 PM

More than eighty years after they were first proposed, neutrinos still remain an enigma. Although they are an integral part of Standard Model but still we know very little about them. In particular, the Dirac or Majorana nature of neutrinos is still unclear with no clear indication of their nature. However, for a long time, theoretical particle physicists believed that neutrinos must be Majorana i
... More

Presented by Rahul SRIVASTAVA
on
24 May 2018
at
2:20 PM

A variety of experiments have been developed over the past decades, aiming at the detection of Weakly Interactive Massive Particles (WIMPs) via their scattering in an instrumented medium. The sensitivity of these experiments has improved with a tremendous speed, thanks to a constant development of detectors and analysis methods. Detectors capable of reconstructing the direction of the nuclear reco
... More

Presented by Prof. A. MURAT GULER

Session:
Parallel Session on DM at Colliders

In this talk, I will discuss the EFT approach to LHC physics and Dark Matter searches regarding its validity and prospects to gain information on the underlying UV physics. In particular in the first case, correlations will be pointed out that allow to directly access the mass of new particles beyond collider reach, while in the second case, a new effective description will be presented that allow
... More

Presented by Dr. Florian GOERTZ
on
24 May 2018
at
4:10 PM

Session:
Parallel Session on Inflation

We study the phenomenology of a Next-to-Minimal Supersymmmetric Standard Model (NMSSM) that can achieve early universe inflation. The Higgs sector of such a model clearly differs from the usual NMSSM and can provide a smoking gun of inflation at low energies.

Presented by Dr. Wolfgang Gregor HOLLIK
on
22 May 2018
at
2:40 PM

We propose a new dynamical relaxation mechanism based on a singlet extension of the MSSM.
In this scenario, a small enough soft mass of the MSSM singlet is responsible for the
electroweak symmetry breaking and the Higgs VEV of order 100 GeV, whereas the effects of a
large soft mass parameter of the Higgs boson, −m_{hu}^2 are dynamically compensated by an
MSSM singlet field. The smallness of the
... More

Presented by Bumseok KYAE
on
24 May 2018
at
4:10 PM

We investigate the electroweak vacuum stability in presence of a scalar dark matter and neutrino mass model through type-I seesaw. The minimal Higgs portal dark matter framework is extended here with another scalar singlet field carrying non-zero vacuum expectation value. Our results reveal that inclusion of this extra scalar not only helps in achieving absolute vacuum stability (even with large n
... More

Presented by Dr. ARUNANSU SIL
on
24 May 2018
at
5:10 PM

It is known that in the absence of a gauge singlet field, a specific class of supersymmetry (SUSY) breaking non-holomorphic (NH) terms can be soft breaking in nature so that they may be considered along with the Minimal Supersymmetric Standard Model (MSSM) and beyond. There have been studies related to these terms in minimal supergravity based models. Consideration of an F-type SUSY breaking scena
... More

Presented by Samadrita MUKHERJEE
on
24 May 2018
at
4:30 PM

Session:
Parallel Session on Inflation

It is important to understand not only the observational constraints on large field inflation, but also any possible theoretical constraints. Among the theoretical constraints, one could focus one's attention to Ultra-Violet (UV) sensitivity. In this talk, I shall present simple variations of the minimal extranatural inflation model of inflation which are completely consistent with CMB observation
... More

Presented by Dr. Gaurav GOSWAMI

We point out that the stringent lower bounds on the masses of additional electrically neutral and charged Higgs bosons crucially depend on the flavour structure of their Yukawa interactions. We show that these bounds can easily be evaded by the introduction of flavour-changing neutral currents in the Higgs sector. As an illustration, we study the phenomenology of a two Higgs doublet model with a Y
... More

Presented by Dr. Ayan PAUL
on
23 May 2018
at
2:20 PM

Session:
Review Talk

Several observables in flavour physics deviate from their Standard-Model
(SM) expectation. The most prominent ones are related to the decay $b\to
s \mu^+ \mu^-$, with a combined statistical significance well above 4
standard deviations. Similarly, branching fractions of $b \to c \tau
\nu$ decays and the direct CP asymmetry in $K\to \pi \pi$ decays exceed
the SM expectation. I'll discuss theoretica
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Presented by Prof. Ulrich NIERSTE
on
23 May 2018
at
9:00 AM

Session:
Parallel Session on Flavor and EFTs

The models with the gauge group $SU(3)_c\times SU(3)_L\times U(1)_X$ (331-models) have
been advocated to explain why there are three fermion generations in Nature. As such they
provide partial understanding of the flavour sector. The hierarchy of fermion masses in
the Standard Model is another puzzle which remains without compelling explanation. In this
talk I present a model that incorporates Fro
... More

Presented by Niko KOIVUNEN
on
23 May 2018
at
5:10 PM

Session:
Plenary Session

For most string vacua, only the chiral matter spectrum can be computed in terms of topological data of the compact extra dimensions, while already the vector-like spectrum remains elusive. If the compact extra dimensions consist of (orbifolds of) tori, however, the string quantisation can be explicitly performed and thus not only the full tower of massless and massive matter states can be computed
... More

Presented by Prof. Gabriele HONECKER
on
24 May 2018
at
12:00 PM

Session:
Parallel Session on Flavor and EFTs

In the near future, fundamental interactions at high-energy scales may be most efficiently studied via precision measurements at low energies. In this talk I will discuss the possible impact of the DUNE neutrino experiment on constraining the SM Effective Field Theory. The unprecedented neutrino flux offers an opportunity to greatly improve the current limits via precision measurements of the trid
... More

Presented by Giovanni GRILLI DI CORTONA
on
23 May 2018
at
4:30 PM

I show how generating hierarchy via the clockwork mechanism can be generalized in various directions including nonabelian global groups, supergravity and Susy breaking.

Presented by Dr. Ido BEN-DAYAN
on
23 May 2018
at
5:10 PM

Session:
Plenary Session

I will discuss phase transitions at the TeV scale, in particular the electroweak one (in extensions of the standard model). I will review the current status of how gravitational waves are generated during the phase transition, and show how the resulting gravitational wave signal can be computed from key properties of the transition. Finally, I will discuss detection prospects at future interferom
... More

Presented by Stephan HUBER
on
25 May 2018
at
10:00 AM

Heavy neutral leptons or massive sterile neutrinos are present in many well-motivated beyond the Standard Model theories, sometimes being accesible at present colliders. Our aim is to discuss the potential of the LHC to produce and discover this kind of new particles when their masses are in the GeV range. Moreover, and depending on their masses and couplings, they can be long-lived and lead to si
... More

Presented by Dr. Xabier MARCANO

Heavy neutral leptons or massive sterile neutrinos are present in many well-motivated beyond the Standard Model theories, sometimes being accesible at present colliders. Our aim is to discuss the potential of the LHC to produce and discover this kind of new particles when their masses are in the GeV range. Moreover, and depending on their masses and couplings, they can be long-lived and lead to si
... More

Presented by Dr. Xabier MARCANO
on
22 May 2018
at
2:00 PM

Long-lived light particles (LLLPs) appear in many extensions of the standard model. LLLPs are usually motivated by the observed small neutrino masses, by dark matter or both. Typical examples for fermionic LLLPs (a.k.a. heavy neutral fermions, HNFs) are sterile neutrinos or the lightest neutralino in R-parity violating supersymmetry. The high luminosity LHC is expected to deliver up to 3/ab of dat
... More

Presented by Simon Zeren WANG
on
22 May 2018
at
2:20 PM

Session:
Plenary Session

With increasingly precise measurements of Higgs boson interactions, we start to set tighter limits on Standard Model extensions. First, I will review the impact of existing and ongoing Higgs coupling measurements on how they constrain such extensions. In the second part of the presentation, I will focus on one of the most important couplings of the scalar sector, the Higgs self-coupling. Given the
... More

Presented by Michael SPANNOWSKY
on
22 May 2018
at
10:00 AM

Contrary to common perception, we show that the current Higgs data does not eliminate the possibility of a sequential fourth generation that get their masses through the same Higgs mechanism as the first three generations. The inability to fix the sign of the bottom-quark Yukawa coupling from the available data plays a crucial role in accommodating a chiral fourth generation which is consistent wi
... More

Presented by Ipsita SAHA
on
23 May 2018
at
4:30 PM

The decays of neutral Higgs bosons into Standard Model fermions and gauge-bosons in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) are investigated at the full one-loop order with some higher-order QCD corrections. We take mixing effects for the external Higgs particles consistently into account. In the beginning, some formal aspects of our approach are discussed, before we compare our
... More

Presented by Dr. Sebastian PAßEHR
on
23 May 2018
at
4:50 PM

The study of the renormalization group improved effective potential of the Standard Model has revealed existence of a local maximum at field strengths of the order of 10^10 GeV. If the Standard Model is valid for very high energy scales, then the possibility of the production of cosmological domain walls in the early Universe occurs. We investigated dynamics of networks of domain walls using latti
... More

Presented by Tomasz KRAJEWSKI
on
22 May 2018
at
3:30 PM

Session:
Parallel Session on Inflation

I will present a model of a hill-climbing inflation based on a scalar-tensor theory. I will show how the reheating can be generated by gravitational particle production and I will present the consequences of the gravitational reheating on the thermal history of the Universe and primordial gravitational waves.

Presented by Dr. Michal ARTYMOWSKI
on
22 May 2018
at
2:00 PM

Session:
Parallel Session on Astro-DM I

Minimal scenarios with light (sub-GeV) dark matter are usually accompanied by a correspondingly light "dark sector". We will show that the presence of the latter usually leads to strong bounds from cosmology and bright detection prospects at fixed target experiments and colliders.

Presented by Mr. Luc DARMÉ
on
23 May 2018
at
5:30 PM

We study the capabilities of IceCube to search for sterile neutrinos with masses above 10 eV by analyzing its νμ disappearance atmospheric neutrino sample. We find that IceCube is not only sensitive to the mixing of sterile neutrinos to muon neutrinos, but also to the more elusive mixing with tau neutrinos through matter effects. The currently released 1-year data shows a mild (around 2σ) prefe
... More

Presented by Julia GEHRLEIN
on
22 May 2018
at
2:00 PM

Session:
Plenary Session

BSM models must be confronted with a series of experimental and
theoretical constraints. On the theoretical side, it is standard to
check the tree-level vacuum stability, the tree-level perturbative
unitarity constraints in the limit of large scattering energies, and
the cut-off scale using one-loop running with tree-level matching. I
will discuss that these constraints can get crucial corrections
... More

Presented by Dr. Florian STAUB
on
21 May 2018
at
3:00 PM

Session:
Parallel Session on DM at Colliders

Many composite Higgs models predict the existence of vector-like quarks with masses outside the reach of the LHC, e.g. mQ > 2 TeV, in particular if these models contain a dark matter candidate. In such models the mass of the new resonances is bounded from above to satisfy the constraint from the observed relic density. We therefore develop new strategies to search for vector-like quarks at a futur
... More

Presented by Dr. Mikael CHALA
on
24 May 2018
at
5:10 PM

Planck scale acts as a threshold where a new description of spacetime is expected to appear. We consider the invariant Planck scale modified/deformed Poincare algebra proposed by Magueijo and Smolin and study the consequences as the Planck scale corrections to the known physics. We get Planck scale modified dispersion relation and an effective invariant ultraviolet energy cut-off (Planck energy).
... More

Presented by Dheeraj Kumar MISHRA

Probably not. I will introduce some different gravity theories which are as good as GR in the sense that all of constraints are first class and therefore a graviton has only 2 polarisations and the structure of the theory at low energies is thus expected to be stable against quantum corrections.

Presented by Chunshan LIN
on
24 May 2018
at
3:00 PM

A compelling mechanism for leptogenesis consists into CP-violating oscillations of mass-degenerate pairs of sterile neutrinos with masses lying at the GeV scale. This kind of setup finds a natural embedding in models like the Inverse See-Saw, where the mass degeneracy of these neutrino pairs is associated to a small violation of the lepton number. We present the resulst of a systematic study based
... More

Presented by Dr. Giorgio ARCADI
on
23 May 2018
at
2:00 PM

Session:
Parallel Session on Astro-DM II

In this work, we consider a model in which the SM is extended by a lepton number gauge group $U(1)_L$. The arising gauge anomalies are canceled by adding two sets of SM vector-like leptons. We further add a scalar field that spontaneously breaks $U(1)_L$. A residual global symmetry ensures the stability of the lightest additional lepton, thus providing a dark matter candidate. We investigate curre
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Presented by Eric MADGE
on
24 May 2018
at
4:50 PM

Session:
Parallel Session on Astro-DM II

The cosmic ray electron + positron flux measured recently by the DAMPE experiment up to 5 TeV has gained great attention. So far, the interpretations focuss on the spectral softening around 0.9 TeV and on a small fluctuation of one data point at 1.4 TeV. We want to point at three additional features that can be found in the data by separating the primary and the seconary compontent of the cosmic r
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Presented by Ms. Annika REINERT
on
24 May 2018
at
4:10 PM

Session:
Plenary Session

It has been conjectured that in theories consistent with quantum
gravity infinite distances in field space coincide with an infinite tower of states
becoming massless exponentially fast. In this talk I present non-trivial evidence
for this conjecture from the study of Type IIB string theory on Calabi-Yau threefolds.
I will also comment on the observation that the behavior of the metric and gaug
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Presented by Dr. Thomas GRIMM
on
24 May 2018
at
11:00 AM

Session:
Review Talk

I review theories of dark matter and their detection

Presented by Kathryn ZUREK
on
25 May 2018
at
9:00 AM

Standard thermal leptogenesis in the type-I seesaw model requires very heavy right-handed neutrinos (RHNs). This diminishes the prospects of directly testing this scenario in experiments and, thus, motivates efforts to construct models that generate the baryon asymmetry of the Universe at a lower RHN mass scale. In this talk, I will discuss two such alternative scenarios: First, I will revisit Ern
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Presented by Dr. Kai SCHMITZ
on
23 May 2018
at
2:20 PM

Mechanisms that yield mass degeneracies in extended Higgs sectors with multiple Higgs doublets are examined. Some puzzling features of a recent 3HDM constructed by Ivanov and Silav are considered that appear to be connected to the mass degeneracies of their model.

Presented by Prof. Howard HABER
on
22 May 2018
at
2:00 PM

Session:
Parallel Session on DM at Colliders

A massive particle charged under the electroweak gauge symmetry is one of the best candidate of the dark matter and called "Minimal dark matter." In this talk, I will discuss new strategies for such a dark matter hunting at collider, using precision measurements of the standard processes.

Presented by Satoshi SHIRAI
on
24 May 2018
at
4:30 PM

Session:
Review Talk

I will give my impressions of model building in the LHC era.
WHAT are the problems for theory, WHERE are the hints for new physics
and WHEN will we know.

Presented by Stuart RABY
on
21 May 2018
at
9:00 AM

I will talk about popular scalar extensions of the Standard Model, namely the singlet extension, the 2-Higgs doublet model (2HDM) and its extension by a singlet scalar. I will focus on the contributions of the added scalars to the anomalous magnetic moment of the muon, and the electric dipole moment of the electron in these models.

Presented by Dr. Venus KEUS
on
22 May 2018
at
2:20 PM

The absence of new physics in current LHC searches leads to increasing interest in a variety of non-minimal extensions of the Standard Model (SM). Also the scale of new physics in widely studied models is pushed to higher energies. Automation tools such as SARAH allow for comprehensive studies of a wider class of models beyond the Standard Model (SM). Not only the tree-level values but also NLO an
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Presented by Martin GABELMANN
on
22 May 2018
at
3:50 PM

Session:
Plenary Session

I review how natural SUSY may emerge from the string landscape and present probability distributions for Higgs and sparticle masses

Presented by Prof. Howard Baer BAER
on
22 May 2018
at
11:30 AM

We consider an extension of the Standard Model by right-handed neutrinos and we argue that, under plausible assumptions, a neutrino mass of O(0.1) eV is naturally generated by the breaking of the lepton number at the Planck scale, possibly by gravitational effects, without the necessity of introducing new mass scales in the model. Some implications of this framework are also briefly discussed.

Presented by Dr. Takashi TOMA
on
24 May 2018
at
2:00 PM

Session:
Plenary Session

b->c cbar s transitions proceed at the tree-level in the weak interactions
in the Standard Model, and for this reason are typically ignored in the search for
new physics. I will show that, in fact, even small BSM contributions can give
observables effects in B-meson lifetime observables, CP-violation measurements,
as well as rare and radiative decays. This can provide useful constraints on or
poss
... More

Presented by Sebastian JAEGER
on
23 May 2018
at
10:00 AM

Session:
Plenary Session

The astrophysical evidence for dark matter suggests that the standard model should be supplemented by a dark sector, containing a particle dark matter candidate. In my talk I will give give an overview of new experimental signatures of non-minimal dark sectors with new interactions, in particular: emerging jets from QCD-like dark sectors at colliders, flavour violating signatures of dark pions in
... More

Presented by Pedro SCHWALLER
on
25 May 2018
at
12:00 PM

Session:
Plenary Session

I will discuss experimental and observational signatures of dark matter with mass at and very well below the MeV scale. The first signature regards dark matter decay into dark radiation states. I will comment on the experimental detectability of dark radiation, and further show that 21 cm astronomy becomes a probe of very light dark radiation; an explanation of the EDGES result is offered. The sec
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Presented by Josef PRADLER
on
25 May 2018
at
3:00 PM

A very important and promizing direction of reasearch is finding better ways of testing Standard Model and New Physics using Effective Field Theory approach and exploiting precision measurements. In this framework, Electroweak Triple Gauge Couplings play a special role, particularly within diboson production processes. However, there is often a cancellation in the inclusive measurements of the for
... More

Presented by Elena VENTURINI
on
23 May 2018
at
2:00 PM

Session:
Plenary Session

I will describe recent results on phenomenological consequences of imposing an exotic CP-symmetry of order 4 in multi-Higgs models. Despite minimality of the assumptions, such models have well shaped scalar and flavor sectors and lead to rich phenomenology to be tested in experiments and astroparticle observations.

Presented by Dr. Igor IVANOV
on
21 May 2018
at
2:30 PM

Session:
Parallel Session on Composite Higgs

Recently there has been revival of interest in partially composite Higgs models, where electroweak symmetry breaking is dynamically induced, and the Higgs boson is a mixture of a composite and an elementary state. While the Goldstone nature of the composite sector explains the lightness of the Higgs, the elementary scalars provide an UV completion for the SM fermion mass generation via traditional
... More

Presented by Dr. Tommi ALANNE
on
22 May 2018
at
3:30 PM

We propose a new non-thermal Leptogenesis mechanism that takes
place during the reheating epoch, and utilizes the Ratchet mechanism. The
interplay between the oscillation of the inflaton during reheating and a
scalar lepton leads to a dynamical system that emulates the well-known
forced pendulum. This is found to produce driven motion in the phase of the
scalar lepton which leads to the generation
... More

Presented by Neil BARRIE
on
23 May 2018
at
3:20 PM

Session:
Plenary Session

The luminosity upgrade of the LHC (HL-LHC) is being actively pursued with the targeted integrated luminosity of 3 ab-1 by the year of 2037. There has been increasing interest to upgrade the energy of the LHC (HE-LHC) to about a c.m. energy of 27 TeV by doubling the magnetic field in the same tunnel, which is part of the effort of the European Strategy of Particle Physics led by CERN. I present a f
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Presented by Tao HAN
on
25 May 2018
at
3:30 PM

Session:
Parallel Session on Unified Models

Grand Unified Theories predict the proton to be unstable and if a particular model is considered, the partial proton decay widths can be calculated. Most often, however, a renormalizable setting is considered and the effective operators possibly describing the physics at the Planck scale are not taken into account. It is well known that one of such effective operators involving the unification gau
... More

Presented by Helena KOLESOVA
on
24 May 2018
at
2:40 PM

Session:
Plenary Session

A second order pole in the scalar kinetic term can lead to a class of inflation models with universal predictions referred to as pole inflation or α-attractors. While this kinetic structure is ubiquitous in supergravity effective field theories, realising a consistent UV complete model in e.g. string theory is a non-trivial task. For one, one expects quantum corrections arising in the vicinity o
... More

Presented by Alexander WESTPHAL
on
24 May 2018
at
11:30 AM

The Littlest Seesaw model based on two right-handed neutrinos with constrained Yukawa couplings provides a highly predictive description of neutrino masses and PMNS mixing parameters. If realised at high energies there will be renormalisation group corrections to the low energy predictions, which depend on the right-handed neutrino masses. We perform a chi squared analysis to determine the right-h
... More

Presented by Sam ROWLEY
on
23 May 2018
at
3:00 PM

In this talk I will present the projected sensitivities of upcoming pulsar timing arrays (PTAs) to gravitational waves produced by first-order phase transitions. In contrast to ground- or space-based detectors these experiments are sensitive to phase transitions that occur around keV to MeV energy scales. Consequently, they are excellent probes of many types of light new physics contributing to no
... More

Presented by Toby OPFERKUCH
on
22 May 2018
at
3:30 PM

3 topics appeared in the description of processes with unstable particles. 1. Plane wave formalism is insufficient for some realistic problems. The wave packets formalism become necessary. Illustration:The t--channel singularity in small angle scattering. 2. Perturbation series become invalid like in the case of infrared divergence in QED, but in more strong form. Illustration: The s--channel sing
... More

Presented by Prof. Ilya GINZBURG
on
23 May 2018
at
5:30 PM

Session:
Parallel Session on Unified Models

The minimal renormalizable SO(10) Higgs model in which the unified symmetry is broken down by the adjoint representation is known to suffer from tachyonic instabilities along all potentially realistic symmetry-breaking chains. Few years ago, this issue has been identified as a mere relic of the tree level calculations and the radiative corrections to the masses of the pair of the “most dangerous
... More

Presented by Katerina JARKOVSKA
on
24 May 2018
at
3:20 PM

Session:
Parallel Session on Axion-DM

The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant fa ~ O(10^11) GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires fa ~ (10^8 − 10^11) GeV.
... More

Presented by Dr. Keisuke HARIGAYA
on
23 May 2018
at
2:00 PM

Session:
Plenary Session

Consistency with quantum gravity can have significant consequences on low energy physics. Interestingly, it seems that not every effective field theory can be consistently coupled to quantum gravity unless it satifies some additional consistency constraints. Recently substantial effort has been dedicated to determine these constraints in terms of black-hole physics and string theory. Some proposal
... More

Presented by Ms. Irene VALENZUELA
on
24 May 2018
at
10:00 AM

Asymptotic safety provides a framework for a UV-complete model of quantum gravity and matter. Within this framework, Renormalization Group flows allow to connect Planck-scale physics to the electroweak scale. I will present indications that asymptotically safe quantum gravity uniquely determines the top Yukawa coupling, resulting in a “retrodiction” of the top-quark mass close to its experimen
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Presented by Aaron HELD
on
24 May 2018
at
2:40 PM

In this talk a new method or renormalisation-group (RG) improvement of effective potentials in models with extended scalar sector is presented. With the use of this method, the RG improved potential can be expressed as the tree-level potential evaluated at a suitably chosen field-dependent scale. This follows from solving the RG equation for the effective potential with a suitably chosen boundary
... More

Presented by Bogumila SWIEZEWSKA
on
24 May 2018
at
4:50 PM

Session:
Parallel Session on Astro-DM II

The recently claimed anomaly in the measurement of the 21 cm hydrogen absorption signal by EDGES at redshift z = 17, if cosmological, requires the existence of new physics. The possible attempts to resolve the anomaly rely on either (i) cooling the hydrogen gas via new dark matter-hydrogen interactions or (ii) modifying the soft photon background beyond the standard CMB (suggested by the ARCADE 2
... More

Presented by Kristjan KANNIKE
on
24 May 2018
at
4:30 PM

I will describe a version of the dimensional regularization of a classically scale invariant theory, motivated by the requirement to preserve scale invariance at the level of loop corrections. The theory is embedded in a nonrenormalizable Lagrangian, where both the dimensionful regulator \mu and suppression scale of higher-dimensional interactions are interpreted as a vev of a new dynamical scalar
... More

Presented by Pawel OLSZEWSKI
on
22 May 2018
at
4:10 PM

I discuss a scenario in which the relaxion field, whose evolution in the early universe is responsible for the smallness of EW scale compared to the cutoff of the theory, also constitutes the Dark Matter of the Universe.

Presented by Enrico MORGANTE
on
23 May 2018
at
4:30 PM

Session:
Parallel Session on DM

Dark matter coupled to light mediators has been invoked to resolve the putative discrepancies between collisionless cold DM and galactic structure observations. However, $\gamma$-ray searches and the CMB strongly constrain such scenarios. To ease the tension, we consider asymmetric DM. We show that, contrary to the common lore, detectable annihilations occur even for large asymmetries, and derive
... More

Presented by Dr. Iason BALDES
on
24 May 2018
at
3:00 PM

Session:
Parallel Session on Unified Models

We study Z′ models arising from SO(10)SO(10), focussing in particular on the gauge group of SU(3)C×SU(2)L×U(1)R×U(1)B−L, broken at the TeV scale to the Standard Model gauge group. This gauge group is well motivated from SO(10) breaking and allows neutrino mass via the linear seesaw mechanism. Assuming supersymmetry, we consider single step gauge unification to predict the gauge couplings, t
... More

Presented by Mr. Simon KING
on
24 May 2018
at
3:00 PM

Session:
Parallel Session on Flavor and EFTs

The understanding of flavor and the strong CP problem could be closely related. Motivated by the idea of Comprehensive Unification of elementary particle forces and families, we propose a minimal SO(3) flavor extension of the of the Standard Model which accounts for the observed fermion mass hierarchies, and provides a dynamical understanding of quark mixing and CP violation.

Presented by Mario REIG
on
23 May 2018
at
4:50 PM

Session:
Plenary Session

The saxion - the modulus of the Peccei-Quinn scalar - or a mixture
of it with the modulus of the Higgs - represents a viable
inflaton candidate, if one takes into account the possible non-minimal coupling
of the PQ scalar to gravity. Remarkably, reheating in saxion/Higgs inflation inevitably
restores the PQ symmetry and results therefore in a lower bound on the axion
mass around 30 micro-eV. O
... More

Presented by Andreas RINGWALD
on
25 May 2018
at
2:00 PM

The electroweak symmetry breaking (EWSB) sector still keeps some mysteries under the sleeve. Questions such as what is the dynamical origin of EWSB, what is the true nature of the Higgs boson or are the properties of this particle the ones predicted in the SM remain unanswered. The LHC is our tool to unveil these mysteries and vector boson scattering (VBS) is the perfect window to access them. In
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Presented by Claudia GARCIA-GARCIA
on
22 May 2018
at
3:30 PM

We describe the many pathways to generate Majorana and Dirac neutrino mass through generalized dimension-5 operators a la Weinberg. The presence of new scalars beyond the Standard Model Higgs doublet implies new possible field contractions, which are required in the case of Dirac neutrinos. We also notice that, in the Dirac neutrino case, the extra symmetries needed to ensure the Dirac nature of n
... More

Presented by Salvador CENTELLES CHULIÁ
on
24 May 2018
at
2:40 PM

Session:
Parallel Session on DM

Self-interactions of dark matter induced by a MeV-scale vector mediator $Z_\text{D}$ can naturally cure some shortcomings of the standard cold dark matter paradigm at small scales. However, if the vector particle decays into Standard Model states, such a scenario is robustly excluded by constraints from energy injection during CMB. We study to what extent this conclusion can be circumvented if $Z_
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Presented by Mr. Sebastian WILD
on
24 May 2018
at
2:40 PM

Session:
Plenary Session

We will discuss several phenomenological signatures that can result from particle production during inflation, with a paricular attentions ot models of axion inflation. The signatures include large non-gaussianity and sourced gravitational waves at CMB scales, primordial black holes, and gravitational waves at interferometer scales

Presented by Marco PELOSO
on
25 May 2018
at
11:00 AM

Session:
Plenary Session

We present a new mechanism for making a scalar parametrically
lighter than the UV cutoff utilizing non-linearly realized discrete
symmetries. The cancelations occur due to a discrete symmetry that is
realized as a shift symmetry on the scalar and as an exchange symmetry
on the particles with which the scalar interacts.

Presented by Anson HOOK
on
21 May 2018
at
11:30 AM

Session:
Review Talk

With the LHC Run II coming to an end and the LHC experiments already preparing for HL-LHC, this talk will review the current status of BSM searches, with particular emphasis on new analysis techniques developed in the recent past and possible implications for the LHC Run III and the long term.

Presented by Maurizio PIERINI
on
22 May 2018
at
9:00 AM

Session:
Plenary Session

I review the experimental indications in favor of short-baseline
neutrino oscillations
and I discuss their interpretation in the framework of 3+1 neutrino
mixing with a
sterile neutrino at the eV scale. I show that the recent results of
the NEOS and DANSS
reactor neutrino experiments give a new model-independent indication in favor of
short-baseline electron antineutrino disappearance, confirming
... More

Presented by Dr. Carlo GIUNTI
on
23 May 2018
at
11:30 AM

We confront recent experimental results on neutrino mixing parameters with the requirements from strong thermal $SO(10)$-inspired leptogenesis. There is a nice agreement with latest global analyses supporting $\sin\delta < 0$ and normal ordering at $ \sim 95\%$ C.L. On the other hand, the more stringent experimental lower bound on the atmospheric mixing angle starts to corner this paradigm. Prompt
... More

Presented by Dr. Marco CHIANESE
on
23 May 2018
at
2:40 PM

The generation of the observed matter-antimatter asymmetry in the universe through baryogenesis cannot be explained in the Standard Model. We therefore investigate the possibility of a strong first order phase transition in the CP-Violating 2-Higgs-Doublet Model (C2HDM) after imposing theoretical and experimental constraints. We study the type I and II C2HDM where one of the neutral Higgs bosons c
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Presented by Prof. Margarete MÜHLLEITNER
on
23 May 2018
at
2:40 PM

Assuming that new physics effects are parametrized by the Standard-Model Effective Field Theory (SMEFT) written in a complete basis of up to dimension-6 operators,
we calculate the CP-conserving one-loop amplitude for the decay h->gamma+gamma in general R_xi-gauges.
We use this gauge invariant amplitude and recent LHC data to check upon sensitivity to various Wilson coefficients entering from a m
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Presented by Dr. Athanasios DEDES
on
22 May 2018
at
4:10 PM

Session:
Parallel Session Formal

We systematically construct all torically resolved SO(10) theories theories with possible additional (discrete) Abelian gauge symmetries. We show that most of these models are connected via higgsing or superconformal matter transitions involving small E8 instantons. Motivated by this observations, we classify superconformal matter transitions in 6d SUGRA theories with Abelian and non-Abelian gauge
... More

Presented by Dr. Paul-Konstantin OEHLMANN
on
23 May 2018
at
2:00 PM

We scrutinize the allowed parameter space of Little Higgs models with the concrete symmetry of T-parity by providing comprehensive LHC analyses of all relevant production channels of heavy vectors, top partners, heavy quarks and heavy leptons and all phenomenologically relevant decay channels. Constraints on the model will be derived from the signatures of jets and missing energy or leptons and mi
... More

Presented by Mr. Daniel DERCKS
on
23 May 2018
at
4:10 PM

Session:
Parallel Session on Astro-DM II

In this talk I will present a new paradigm for dark matter production in which the dark constituent of our Universe is in contact with the visible bath exclusively through the inflationary sector. I will show that experimental constraints on the inflationary energy scale and the dark matter relic density can be balanced by the use of a very minimal set up and that such a construction allows to con
... More

Presented by Dr. Lucien HEURTIER
on
24 May 2018
at
5:10 PM

Horava gravity is a proposal for a non-relativistic UV completion of General Relativity, which has been proven to be renormalizable and (in 2+1 dimensions) asymptotically free while propagating non-trivial degrees of freedom. We review the current status of the theory as a plausible proposal for a description of quantum gravity and describe the main challenges for its success.

Presented by Mario HERRERO VALEA
on
24 May 2018
at
2:20 PM

Session:
Plenary Session

In this talk we discuss various Theories of Flavour from the Planck scale to the
Electroweak Scale, ranging from SUSY GUTs with Flavour Symmetry (with or without extra
dimensions) to Flavourful Z' Models at the Electroweak scale capable of accounting for
R_K(*).

Presented by Steve KING
on
21 May 2018
at
4:30 PM

We construct a model of quark-lepton unification at the TeV scale based on an SU(4) gauge symmetry, while still having acceptable neutrino masses and enough suppression in flavor changing neutral currents. An approximate U(2) flavor symmetry is an artifact of family-dependent gauge charges leading to a natural realization of the CKM mixing matrix. The model predicts sizeable violation of PMNS unit
... More

Presented by Dr. Benjamin STEFANEK
on
22 May 2018
at
2:40 PM

The Standard Model Effective Field Theory (SMEFT) provides a consistent formalism to parametrise the effects of heavy new physics appearing as deviations from SM expectations. One of the key goals of the LHC legacy will be to cover this parameter space as much as possible and contribute to a global fit of the EFT parameter space and, hopefully, provide hints on the nature of physics beyond the SM.
... More

Presented by Ken MIMASU
on
22 May 2018
at
3:50 PM

Session:
Parallel Session on DM at Colliders

We present a comprehensive analysis of top-philic Majorana dark matter that interacts via a colored t-channel mediator. Despite the simplicity of the model - introducing three parameters only - it provides an extremely rich phenomenology allowing to accommodate the relic density for a large range of coupling strengths spanning over six orders of magnitude. This model features all 'exceptional' mec
... More

Presented by Dr. Jan HEISIG
on
24 May 2018
at
4:50 PM

Despite great efforts over several decades, neutrinoless double beta decay has not yet been detected and neutrinos could be Dirac particles. In this talk we present a “scotogenic” mechanism relating small neutrino mass and cosmological dark matter. Neutrinos are Dirac fermions with masses arising only in two-loop order through the sector responsible for dark matter. A global spontaneously brok
... More

Presented by Dr. EDUARDO PEINADO
on
24 May 2018
at
3:00 PM

Session:
Parallel Session on Astro-DM I

Dark matter that is capable of sufficiently heating a local region in a white dwarf will trigger runaway fusion and ignite a type 1a supernova. We consider dark matter (DM) candidates that heat through the production of high-energy standard model (SM) particles, and show that such particles will efficiently thermalize the white dwarf medium and ignite supernovae. Based on the existence of long-liv
... More

Presented by Ryan JANISH
on
23 May 2018
at
4:10 PM

Session:
Parallel Session on Unified Models

The flipped SU(5) unification represents one of the rare cases in which the Witten's loop mechanism for the radiative RH neutrino mass generation may be implemented in a potentially realistic manner. It was shown recently that, in a large part of the parameter space, the tight flavour structure of the minimal model of this kind yields relatively strong constraints on the principal smoking-gun obse
... More

Presented by Michal MALINSKY
on
24 May 2018
at
2:20 PM

Session:
Parallel Session Formal

The classical part of Yukawa couplings from D6-branes is computed by summing over worldsheet instantons. On non-factorisable tori the worldsheet instantons obey selection rules, which depend on the underlying lattice of the torus. Quantum corrections to the couplings are obtained by T-dualizing the setup and computing the overlapping wavefunctions of three chiral matter fields.

Presented by Mr. Christoph LIYANAGE
on
23 May 2018
at
2:20 PM