Conveners
T10: Searches for New Physics: Part 1
- Cristina Botta (University of Zurich)
T10: Searches for New Physics: Part 2
- Marija Vranjes Milosavljevic (Institute of Physics Belgrade)
T10: Searches for New Physics: Part 3
- Pedro Schwaller (Johannes Gutenberg University Mainz)
T10: Searches for New Physics: Part 4
- Marija Vranjes Milosavljevic (Institute of Physics Belgrade)
T10: Searches for New Physics: Part 5
- Cristina Botta (University of Zurich)
T10: Searches for New Physics: Part 6
- Pedro Schwaller (Johannes Gutenberg University Mainz)
T10: Searches for New Physics: Part 7
- Marija Vranjes Milosavljevic (Institute of Physics Belgrade)
- Cristina Botta (University of Zurich)
T10: Searches for New Physics: Part 8
- Akitaka Ariga (Chiba University)
- Pedro Schwaller (Johannes Gutenberg University Mainz)
T10: Searches for New Physics: Part 9
- Akitaka Ariga (Chiba University)
Description
All talks in this session will be 12 mins + 3 mins for the discussion.
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the gluons and third generation quarks with masses light enough to be produced at the LHC. This talk will present the latest results...
Several searches for supersymmetric partners of the top quark and tau lepton have been performed by the CMS Collaboration using the full dataset of proton-proton collisions collected during the Run 2 of the LHC at a center-of-mass energy of 13 TeV. The main features and results of these analyses will be presented.
The direct production of electroweak SUSY particles, including sleptons, charginos, and neutralinos, is a particularly interesting area of search at the LHC, as considerations on dark matter and the naturalness of the Higgs mass motivate the existence of light electroweakinos. The small production cross sections lead to difficult searches, despite relatively clean final states. This talk will...
Several searches for supersymmetry produced through electroweak processes have been performed by the CMS Collaboration using the full dataset of proton-proton collisions collected during the Run 2 of the LHC at a center-of-mass energy of 13 TeV. The main features and results of analyses that select events with leptonic and hadronic final states will be presented.
Supersymmetric models are characterized by a strong diversity of experimental signatures. Since general-purpose searches have not yet given any clear indication of new physics, dedicated methodologies and tools have been developed to target the regions of the parameter space where the analysis is most challenging and SUSY might still lie undetected. This presentation will describe relevant...
Supersymmetry models in which R-parity violation occurs predict a wide range of experimental signatures at the LHC, including many high-multiplicity final states without large missing transverse momentum. These models are motivated by the hierarchy problem and for some parameters naturally explain the lightness of the standard model neutrinos. Searches for RPV SUSY signatures require dedicated...
We present an update on the constraints on general MSSM scenarios with non-minimal sources of flavour violation (NMFV), including all theoretical constraints and the most recent experimental bounds.
Using an MCMC algorithm and the public code SuperIso, we compute various flavour observables and the muon $(g-2)$ and impose the LHC direct search limits.
We present an up-to-date...
We introduce a new approach to set limits on long-lived charged particles using neutrino telescopes and apply it to data. Towards the horizon, we expect a suppression of low-energy muons and electrons, due to the amount of material they must traverse, to reach the detector. Should the new long-lived charged particle possess a larger mass than the muon, then its energy loss will be suppressed...
BESIII has collected 448.2 M $\psi(3686)$ data set and 10 B $J/\psi$ data set. The huge clean data sample provide an excellent chance to search for new physics. We report the search for decay $J/\psi\to\gamma + invisible$, which is predicted by next-to-minimal supersymmetric model. Without significant signal found, we gave around 6.2 times better upper limits than previous CLEO-c’s results. In...
Recent searches for BSM Higgses (both neutral and charged) performed by the CMS experiment at a center of mass of 13 TeV will be presented.
The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable to solely explain some observations. Many extensions addressing such shortcomings introduce additional Higgs-like bosons which can be either neutral, singly-charged or...
Many extensions to the Standard Model predicts new particles decaying into two bosons (W, Z, photon, or Higgs bosons) making these important signatures in the search for new physics. Searches for such diboson resonances have been performed in final states with different numbers of leptons, photons, as well as jets and b-jets where new jet substructure techniques are used to disentangle the...
We present a summary of searches for new heavy resonances decaying into pairs or triplets of bosons, performed on proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. A common feature of these searches is the boosted topology, where the decay products of the considered bosons (both electroweak W, Z bosons and the Higgs boson) are...
Exotic decays of the Higgs boson provide a unique window for the discovery of new physics, as the Higgs boson may couple to hidden-sector states that do not interact under the Standard Model gauge transformations. Models predicting exotic Higgs boson decays to pseudoscalars can explain the galactic centre gamma-ray excess, if the additional pseudoscalar acts as the dark matter mediator. In...
Recent CMS searches for additional scalars (pp->a, Maaa) will be presented.
The presence of charged Higgs bosons is a generic prediction of multiplet extensions of the Standard Model (SM) Higgs sector. Focusing on the Two-Higgs-Doublet-Model (2HDM), we discuss the charged Higgs boson collider phenomenology in the theoretically and experimentally viable parameter space. While almost all existing experimental searches at the LHC target the fermionic decays of charged...
In several searches for additional Higgs bosons at the LHC, in particular the CMS search in the $pp \to \phi \to t \bar t$ channel and the ATLAS search in the $pp \to \phi \to \tau^+\tau^-$ channel, a local excess at the level of $3\,\sigma$ or above has been observed at a mass scale of $m_\phi \approx 400$~GeV. We investigate to what extent a possible signal in those channels could be...
We discuss a ∼ 3 σ signal (local) in the light Higgs-boson search in the diphoton decay
mode at ∼ 96 GeV as reported by CMS, together with a ∼ 2 σ excess (local) in the bb̄
final state at LEP in the same mass range. We interpret this possible signal as a Higgs
boson in the 2 Higgs Doublet Model with an additional complex Higgs singlet (2HDMS).
We find that the lightest CP-even Higgs boson...
Many new-physics signatures at the LHC produce highly boosted particles, leading to close-by objects in the detector and necessitating jet substructure techniques to disentangle the hadronic decay products. This talk presents the latest ATLAS results for searches for heavy W’ and Z’ resonances in top-bottom, di-top and 4-top final states using 13 TeV data. It will explain the techniques...
We study $Z^{\prime}$ phenomenology at hadron colliders in an $U(1)^{\prime}$ extended MSSM. We choose a $U(1)^{\prime}$ model with a secluded sector, where the tension between the electroweak scale and developing a large enough mass for $Z^{\prime}$ is resolved by incorporating three additional singlet fields into the model. We perform a detailed analysis of the production, followed by...
We present results from searches for resonances with enhanced couplings to third generation quarks, based on proton-proton collision data at a centre-of-mass energy of 13 TeV recorded by CMS. The signatures include single and pair production of vector-like quarks and heavy resonances decaying to third generation quarks. A wide range of final states, from multi-leptonic to entirely hadronic is...
Vector like quarks appear in many theories beyond the Standard Model as a way to cancel the mass divergence for the Higgs boson. The talk will focus on the most recent results using 13 TeV pp collision data collected by the ATLAS detector. This presentation will address the analysis techniques, in particular the selection criteria, the background modeling and the related experimental...
Leptoquarks (LQ) are predicted by many new physics theories to describe the similarities between the lepton and quark sectors of the Standard Model and offer an attractive potential explanation for the lepton flavour anomalies observed at LHCb and flavour factories. The ATLAS experiment has a broad program of direct searches for leptoquarks, coupling to the first-, second- or third-generation...
The $U_1$ leptoquark is the popular candidate to explain the persistent 𝐵-anomalies. In this talk, I will discuss the bounds which can be imposed on a $U_1$ leptoquark model using the latest LHC data. The current LHC data is quite sensitive towards the mass of $U_1$ and its couplings with the Standard Model second and third-generation fermions. I will discuss some simple scenarios with...
Many theories beyond the Standard Model predict new phenomena, such as Z’, W’ bosons or heavy neutrinos, in final states with isolated, high-pt leptons (e/mu/tau). Searches for new physics with such signatures, produced either resonantly or non-resonantly, including a general search using multilepton final states are performed using the ATLAS experiment at the LHC. Lepton flavor violation...
Many new physics models, e.g., compositeness, extra dimensions, extended Higgs sectors, supersymmetric theories, and dark sector extensions, are expected to manifest themselves in the final states with leptons and photons. This talk presents searches in CMS for new phenomena in the final states that include leptons and photons, focusing on the recent results obtained using the full Run-II...
Many new physics models, e.g., compositeness, extra dimensions, excited quarks, and dark matter mediators, are expected to manifest themselves in final states with jets. This talk presents searches in CMS for new phenomena in the final states that include jets, focusing on the recent results obtained using the full Run-II data-set collected at the LHC.
New physics may have gone unseen so far due to it being hidden in a dark sector. This may result in a rich phenomenology which we can access through portal interactions. In this talk, we present recent results from dark-sector searches in CMS using the full Run-II data-set of the LHC.
Scenarios of strongly interacting dark matter, where confinement in a new non-abelian dark sector leads to composite dark matter candidate are increasingly at the focus of LHC searches. These scenarios where bound state masses are low compared to the LHC scale lead to exotic darkjet signatures such as semi-visible, emerging jets. With the example of an SU(Nd) gauge group, we present the impact...
Pseudo-Nambu-Goldstone bosons (pNGBs) are attractive dark matter (DM) candidates since they are coupled to the Standard Model (SM) predominantly through derivative interactions. Thereby, they naturally evade the strong existing limits inferred from DM direct detection experiments. Working in an effective field theory that includes both derivative and non-derivative DM-SM operators, we perform...
We derive limits on millicharged dark states, as well as particles with electric or magnetic dipole moments, from the number of observed forward electron scattering events at the Big European Bubble Chamber in the 1982 CERN-WA-066 beam dump experiment. The dark states are produced by the 400 GeV proton beam primarily through the decays of mesons produced in the beam dump, and the lack of...
Searches for heavy neutral lepton production in K+ --> e+N and K+ --> mu+N decays using the data set collected by the NA62 experiment at CERN in 2016-18 are presented. Upper limits on the elements of the extended neutrino mixing matrix $|U_{e4}|^2$ and $|U_{\mu4}|^2$ are established at the levels of $10^{-9}$ and $10^{-8}$, respectively, improving on the earlier searches for heavy neutral...
Many extensions of the standard model predict new particles with long lifetimes or other properties, that give rise to non-conventional signatures in the detector. This talk discusses new techniques to detect such signatures in the CMS detector, and presents recent results from such searches in CMS using the full Run-II data-set of the LHC.
Various theories beyond the Standard Model predict unique signatures that are difficult to reconstruct and for which estimating the background rate is also a challenge. Signatures from displaced decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of the electron or high mass stable charged...
The unique design of the LHCb detector with a flexible trigger and a precision vertex tracker, offers the possibility to search for long-lived particles with low masses and short lifetimes, in complementarity with other general-purpose detectors at the LHC. Searches have been performed at LHCb, in fully leptonic and semi-leptonic final states. In particular, searches for long-lived particles...
Long-lived particles have become a new frontier in the exploration of physics beyond the Standard Model. In this paper, we present the implementation of four types of long-lived particle searches, viz. displaced leptons, disappearing track, displaced vertex (together with muons or with missing energy), and heavy charged tracks. These four categories cover the signatures of a large range of...
In this work we study long-lived light mediators which are well-motivated for connecting the dark sector with standard model particles. Experiments like ATLAS and CMS have placed strong bounds on heavy mediators with prompt decay, however the landscape of light long-lived mediators needs attention. Current experimental constraints have pushed the allowed mixing with the SM Higgs boson for...
We discuss non-resonant ALP-mediated diboson production, a collider probe for axion-like particles (ALPs) which takes advantage of the derivative nature of their interactions with Standard Model particles; here ALPs participate as off-shell mediators of 2 → 2 scattering processes at colliders like the LHC. The power of this novel type of search was first tested by deriving limits on ALP...
We study axion effective field theories (EFTs), with a focus on axion couplings to massive chiral gauge fields. We investigate the EFT interactions that participate in processes with an axion and two gauge bosons, and we show that, when massive chiral gauge fields are present, such interactions do not entirely originate from the usual anomalous EFT terms. When applied to the case of the...
We confront the Minimal Supersymmetric Standard Model (MSSM) with the recent measurement of (g-2)_mu, the Dark Matter (DM) relic density, DM direct detection limits and electroweak SUSY searches at the LHC. We demonstrate that various distinct regions of the parameter space can fulfill all experimental constraints. We present predictions for future pp and e+e- colliders to explore these regions.
The Fermilab Muon $g-2$ experiment reported the results of its Run-1 measurement of the anomalous magnetic moment $a_\mu^{\textrm{FNAL}}$, which is in full agreement with the previous BNL measurement and pushes the world average deviation $\Delta a_\mu^{\text{2021}}$ from the Standard Model to a significance of $4.2\sigma$. In this talk I will present an extensive survey of its impact on...
Recent precise determination of the electron anomalous magnetic moment (AMM) adds to the longstanding tension of the muon AMM and together strongly point towards physics beyond the Standard Model. Here we present a solution to both anomalies via a light scalar that emerges from a second Higgs doublet and resides in the $\mathcal{O}(10)$-MeV to $\mathcal{O}(1)$-GeV mass range. A scalar of...
The Positronium (Ps) system, a bound state of an electron and a positron, is suitable for testing the predictions of quantum electrodynamics (QED), since its properties can be perturbatively calculated to high accuracy and, unlike the hydrogen system, is not affected by finite size or QCD effects at current experimental precision level. This makes the Ps atom a good laboratory to test the...
In this talk, we present a minimal viable scenario that unifies the gauge symmetries of the SM and their breaking sector. Our Gauge-Higgs Grand Unification setup employs 5D warped space with a SU(6) bulk gauge field that includes both a SU(5) grand unified theory (GUT) and a Higgs sector as a scalar component of the 5D vector field, solving the hierarchy problem. By appropriately breaking the...
In this work, we provide a simple model in order to compute the probability to obtain a given hierarchy between two scales. In particular, we work in a model with a given gauge symmetry and two scalar doublets. By the Coleman-Weinberg mechanism, the gauge bosons and scalars obtain different masses, corresponding to the light and heavy sectors. We analyze the mass ratio of these sectors in...
Jet identification tools are crucial for new physics searches at the LHC and at future colliders. We introduce the concept of Mass Unspecific Supervised Tagging (MUST) which relies on considering both jet mass and transverse momentum varying over wide ranges as input variables — together with jet substructure observables — of a multivariate tool. This approach not only provides a single...
We report the results of a meta-analysis conducted to examine possible biases in the uncertainty values published in papers by the LHC experiments. Due to limited availability of computer readable data, we perform this analysis using custom developed python code that extracts the information from the vector graphics source files of the plots in the papers. The aim is to compute the percentages...
We describe the outcome of a data challenge to detect signals of new physics at the LHC using unsupervised machine learning algorithms conducted as part of the Dark Machines Initiative and the Les Houches 2019 workshop on Physics at TeV colliders. We first define and describe a large benchmark dataset, consisting of $>1$ Billion simulated LHC events corresponding to 10 fb$^{-1}$ of...
Even the simplest consistent models of Heavy Neutral Leptons (HNLs) already feature significant complexity, making them impractical for reporting experimental results. In order to keep this complexity manageable, experiments typically interpret their results within simplified models, where e.g. one HNL couples to a single lepton flavor. Unfortunately, such models are in direct contradiction...
The unprecedented collision energy of the LHC has opened up a new discovery frontier. Unfortunately, signs of new physics have yet to be seen. The LHC's first dedicated search experiment, MoEDAL, started data taking for LHC's Run-2. MoEDAL is designed to search highly ionising particle avatars of new physics using p-p and heavy-ion collisions at the LHC. The planned upgrade for MoEDAL at...
The FASER experiment is a new small and inexpensive experiment that is being placed 480 meters downstream of the ATLAS experiment at the CERN LHC. The experiment will shed light on currently unexplored phenomena, having the potential to make a revolutionary discovery. FASER is designed to capture decays of exotic particles, produced in the very forward region, out of the ATLAS detector...
We report on the expected sensitivity of dedicated scintillator-based detectors at the LHC for elementary particles with charges much smaller than the electron charge. Having secured the necessary funding, we plan to construct two detectors, including a novel slab detector configuration, for the LHC Run 3. The dataset provided by a prototype scintillator-based detector has been used to...
The High-Luminosity Large Hadron Collider (HL-LHC) is expected to deliver an integrated luminosity of up to 3000 fb-1. The very high instantaneous luminosity will lead to about 200 proton-proton collisions per bunch crossing (“pileup”) superimposed to each event of interest, therefore providing extremely challenging experimental conditions. Prospects for future BSM Physics studies at the...
Evidence for electron-muon universality violation that has been revealed in $b\to s \ell\ell$ transitions in the observables $R_{K,K^*}$ by the LHCb Collaboration can be explained with spin-1 leptoquarks in $SU(2)_L$ singlet $V_1$ or triplet $V_3$ representations in the ${\cal{O}}(1-10)$ TeV range. We explore the sensitivity of the high luminosity LHC (HL-LHC) and future proton-proton...
Triggering long-lived particles (LLPs) at the first stage of the trigger system is very crucial in LLP searches to ensure that we do not miss them at the very beginning. The future High Luminosity runs of the Large Hadron Collider will have an increased number of pile-up events per bunch crossing. There will be major upgrades in hardware, firmware and software sides, like tracking at level-1...
The LHeC and the FCC-he offer fascinating, unique possibilities for discovering BSM physics in DIS, both due to their large centre-of-mass energies and high luminosities. In this talk we will review most recent studies as presented in the 2020 LHeC Conceptual Design Report update [1]. We will show the prospects for observing extensions of the Higgs sectors both with charged and neutral...
The European Spallation Source ESS, presently under construction, in Lund, Sweden, is a multi-disciplinary international laboratory. It will operate the world's most powerful pulsed neutron source. Taking advantage of the unique potential of the ESS, the NNBAR collaboration proposed a two-stage program of experiments to perform high precision searches for neutron conversion in a range of...
The Belle II experiment at the asymmetric $e^+e^-$ collider, SuperKEKB, is a substantial upgrade of the Belle/KEKB experiment. Belle II aims to record 50 ab$^{-1}$ of data over the course of the project. During the first physics runs in 2018-2020, around 100 fb$^{-1}$ were collected. Large improvements in the instantaneous luminosity are expected in the coming years. The Belle II detector...
Although the LHC experiments have searched for and excluded many proposed new particles up to masses close to 1 TeV, there are many scenarios that are difficult to address at a hadron collider. This talk will review a number of these scenarios and present the expectations for searches at an electron-positron collider such as the International Linear Collider. The cases discussed include the...
The Compact Linear Collider (CLIC) is a mature option for a future
electron-positron collider operating at centre-of-mass energies of up
to 3 TeV. CLIC would be built and operated in a staged approach with
three centre-of-mass energy stages currently assumed to be 380 GeV,
1.5 TeV, and 3 TeV. A selection of results from recent studies will be
presented showing that CLIC has excellent...
The THDMa is a new physics model that extends the scalar sector of the Standard Model by an additional doublet as well as a pseudoscalar singlet and allows for mixing between all possible scalar states. In the gauge eigenbasis, the additional pseudoscalar serves as a portal to the dark sector, with a priori any dark matter spin states. The Inert Doublet model is another intriguing new physics...
The diphoton channel at lepton colliders, $e^+e^- (\mu^+\mu^-) \to \gamma \gamma$, has a remarkable feature that the leading new physics contribution comes only from dimension-eight operators. This contribution is subject to a set of positivity bounds, derived from fundamental principles of Quantum Field Theory, such as unitarity, locality and analyticity. These positivity bounds are thus...
We discuss the physics potential of a multi-TeV muon collider. We present the results for the main SM processes together with popular BSM models, emphasizing the annihilation and VBF regime at very-high energies. We also discuss some preliminary results about the Effective Vector Boson Approximation and its implementation in MadGraph5_aMC@NLO.
Experimental anomalies like the muon g-2 and the decay of the B meson $B\to K\mu\mu$ suggest the existence of interactions that predominantly talk to the muon. The muon philic nature of these hypothetical interactions is necessary to avoid experimental constraints on lepton flavor violating processes. Models that explain g-2 feature either light weakly coupled states or heavy strongly coupled...
The proposed LUXE experiment at the DESY aims to probe QED at the nonperturbative regime in collisions between high-intensity laser pulses and high-energy electron or photon beams. This setup also provides a unique opportunity to search for physics beyond the standard model. In this talk we show that by leveraging the large photon flux generated at LUXE, one can probe axion-like-particles...
Flavor violation in the top sector allows an extra few GeV contribution to the Higgs mass and thereby could reduce the SUSY breaking scale to remain within a few TeV. In this talk we discuss our findings of a detailed investigation on the CMSSM parameter scan particularly in the context of the LHC Higgs observation using the information-theoretic approach and will demonstrate its impact on...
We perform an analysis of the vacuum stability of the neutral scalar potential of the $\mu$-from-$\nu$ Supersymmetric Standard Model ($\mu\nu$SSM). As an example scenario, we discuss the alignment without decoupling limit of the $\mu\nu$SSM, for which we demonstrate that large parts of the parameter space are plagued by unphysical minima deeper than the electroweak minimum. In order to...
From nanoscience to high energy physics and cosmology, fluctuation-induced phenomena are accepted as underlying mechanism of some most interesting features of the physical world. The Casimir effect is one of the most direct manifestations of the existence of the vacuum quantum fluctuations, discovered by H. B Casimir in 1948, and experimentally confirmed about one decade later by M. J....
We discuss the possibility of probing additional top Yukawa couplings via charged Higgs boson (H+) production at the Large Hadron Collider. The context is general Two Higgs Doublet Model (g2HDM). We show that additional top Yukawa couplings ρtc and ρtt in g2HDM can be searched via cg→bH+→bt ̄b process at the LHC with evidence may emerge as early as in the Run 3 data. A discovery may shed...
Composite Higgs models provide a natural solution to the gauge hierarchy problem of the Standard Model. Those models generally predict the existence of multi-TeV composite vector and fermion resonances. In this talk I discuss the possibility of searching for such resonances at a multi-TeV muon collider. Various production and decay channels are discussed, and projections for mass reach are...
In the context of simulation and reconstruction for the Muon Collider, muon reconstruction efficiency has been evaluated to explore the potential for the study of dark-SUSY channels. In dark-SUSY models, supersymmetric particles act as a portal between Standard Model particles and the dark sector. In this analysis, the lightest Minimal Supersymmetric Standard Model neutralino decays, on one...
Constructing a robust background model is one of the main challenges in particle physics data analysis. A common strategy is to simulate the background process, though this is not always possible, and the uncertainties arising from simulation-based background modelling or from limited simulation statistics often limit the physics sensitivity. Two novel data-driven background modelling...
The design, expected sensitivity, and current status of the FASER detector are presented. The FASER detector construction was recently completed and it is now undergoing commissioning and preparation for taking data starting in 2022 during Run 3 of the LHC. FASER is dedicated to searching for long-lived particles beyond the standard model. Though extremely rare, such particles may be produced...
Neutrinos are probably the most mysterious particles of the Standard Model. The mass hierarchy and oscillations, as well as the nature of their antiparticles, are currently being studied in experiments around the world. Moreover, in many models of the New Physics, baryon asymmetry or dark matter density in the universe are explained by introducing new species of neutrinos. Among others, heavy...
We explore the implications of g-2 new result to five models based on the SU(3)C×SU(3)L×U(1)N gauge symmetry and put our conclusions into perspective with LHC bounds. We show that previous conclusions found in the context of such models change if there are more than one heavy particle running in the loop. Moreover, having in mind the projected precision aimed by the g-2 experiment at FERMILAB,...
In our work we study the cosmological phase transition (PT) in a conformal extension of the Standard Model (SM). The model considered is called SU(2)cSM, it extends the SM gauge group by an additional hidden SU(2)$_X$ gauge group, and a scalar doublet (whilist singlet under SM gauge group). The tree-level potential has no mass terms, all the masses are generated via the Coleman-Weinberg...
Lorentz symmetry is one of the cornerstone of both general relativity and the standard model of particle physics . We study the violation of Lorentz symmetry in some basic phenomena in quantum physics. Using the Green’s function, and the source 4-current, the differential equation of 4-vector of electromagnetic potential is solved and the modified coulomb potential is obtained by some...
The next generation helioscopes babyIAXO and IAXO will search for evidence of axion and axion-like particles (ALPs) produced in the interior of the Sun. A very promising candidate for the focal plane detectors are low temperature metallic magnetic calorimeters (MMCs). Combining good energy resolution and high quantum efficiency, MMC-based detectors would allow to investigate the solar axion...
In order to suppress pile-up effects and improve resolution, ATLAS employs a suite of working points for missing transverse momentum ($p_{\text{T}}^{\text{miss}}$) reconstruction, and each is optimal for different event topologies and different beam conditions. A neural network (NN) can exploit various event properties to pick the optimal working point on an event-by-event basis and also...
Universal Extra Dimension (UED) is a well-motivated and well-studied scenario. One of the main motivations is the presence of a dark matter (DM) candidate namely, the lightest level-1 Kaluza-Klein (KK) particle (LKP), in the particle spectrum of UED. The minimal version of UED (mUED) scenario is highly predictive with only two parameters namely, the radius of compactification and cut-off...
We present new advances in the minimal SO(10) Higgs model where the $45\oplus126$ scalars determine spontaneous symmetry breaking down to the Standard model. The comprehensive analysis of all theoretical aspects was performed extending previous results. Computational tools, including full one-loop mass corrections and one-loop scalar beta functions, were developed and allowed us to construct...
The general U$(1)_X$ extension of the Standard Model (SM) is a well motivated scenario which has a plenty of new physics options. Such a model is anomaly free which requires to add three generations of the SM singlet right-handed neutrinos (RHNs) which naturally generates the light neutrino masses by the seesaw mechanism.This offers interesting phenomenological aspects in the model. In...
We consider the Higgs Triplet Model HTM not restricted by the custodial symmetry and the Minimal Left-Right Symmetric Model MLRSM. The models include scalar triplets with different complexity of scalar potentials and, due to experimental restrictions, completely different scales of non-standard triplet vacuum expectation values. In both models, a doubly charged Higgs boson $H^{\pm\pm}$ can...
I will present precision predictions for scalar leptoquark pair production at hadron colliders. Apart from QCD contributions, included are the lepton t-channel exchange diagrams relevant in the light of the recent B-flavor anomalies. All contributions are evaluated at next-to-leading order in QCD and improved by resummation corrections, in the threshold regime, from soft-gluon radiation at...
In 2012, the ATLAS and CMS experiments jointly discovered the Higgs boson, a key particle of the Standard Model of particle physics. This discovery raised new questions, in particular about the mass hierarchy. The existence of new particles could help answering this problem, a Higgs-like resonance being one of them. Various theories beyond the Standard Model predict the existence of such new...
As a proposed Higgs factory, the cornerstone of the FCC-ee physics program is the exploration of the Higgs boson at center-of-mass energies of 240 to 365 GeV. Direct and model-independent measurement of its coupling to the Z boson through the study of the Z boson recoil mass spectrum. The recoil mass analysis strategy can be deployed to search for non-SM Higgs boson decays such as Higgs boson...
This poster presents a search for charged Higgs bosons decaying into WW or ZW bosons, involving experimental signatures with two leptons of the same charge, or three or four leptons with a variety of charge combinations, missing transverse momentum and jets. Some focus will be given on the same-charge leptons channel signature. A data sample of proton–proton collisions at a centre-of-mass...
A novel search for exotic decays of the Higgs boson to pairs of long-lived neutral particles, each decaying to a bottom quark pair, is performed using 139 fb-1 of √s=13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Events consistent with the production of a Higgs boson in association with a leptonically decaying Z boson are analyzed. Long-lived particle (LLP)...
In multiple beyond the SM scenarios, the 125 GeV Higgs boson can decay to light pseudoscalars (a), which each decay into two photons, resulting in a four photon final state. We present a search for exotic decays of the SM Higgs boson in the four photon final state using 131.8 fb-1 of proton-proton collision data collected by the CMS experiment at a center-of-mass energy of 13 TeV. This...
A search for supersymmetry involving the pair production of gluions decaying via stop quarks into the lightest neutralino is reported. The search uses LHC proton-proton collision data at the center-of-mass energy sqrt(s)=13 TeV with an integrated luminosity of 139 inverse fb collected with the ATLAS detector in 2015-2018. The search is performed in events containing large missing transverse...
A search for heavy neutral Higgs bosons is performed using the LHC Run-2 data, corresponding to an integrated luminosity of 139/fb of proton-proton collisions at sqrt(s) = 13 TeV recorded with the ATLAS detector. The search for heavy resonances is performed over the mass range 0.2–2.5 TeV for the tau+ tau- decay with at least one tau-lepton decaying into final states with hadrons. The data are...
Natural supersymmetry (SUSY) suggests light higgsinos possibly within the discovery reach of Run-2 of the LHC. This poster presents the lat- est result of a search for R-parity violating (RPV) SUSY in final states with one lepton and high jet and b-jet multiplicities. In a target model supersymmetric higgsinos are produced in pairs and decay via an RPV coupling to three quarks. The ttbar̄...
A search for light charged Higgs boson (m_H+ = 60-160 GeV) in t to bH+ is presented. The analysis focuses on top-quark pair events in which one top quark decays to Wb, with the W boson decaying leptonically, and the other top quark decays to bH+, with H+ decaying subsequently to a charm and a bottom quark (H+ to cb). The search is based on pp collisions at sqrt(s) = 13 TeV recorded by the...
A search for scalar top quark pair production at the LHC with the CMS experiment is presented. This search targets a region of parameter space where the kinematics of top squark pair production and top quark pair production are very similar because of the mass difference between the top squark and the neutralino is close to the top quark mass. The search is performed with the full dataset of...
Traditional searches for supersymmetry at LHC collider experiments have returned null results thus far. The expected, characteristic signature of high missing energy (MET) final states has not been observed. Motivated by this, our analysis searches for “stealthier” SUSY where high MET signatures would not manifest. Two models considered here are Stealth and R-parity violating SUSY and evidence...
A search for W’ production with decay to a top quark and a bottom quark in proton-proton collisions at √s=13 TeV with the ATLAS detector is presented. The hadronic decay of the top quark is identified using DNN-based boosted-object techniques. The dominant background is obtained by a data-driven method with small systematic uncertainties. The results are presented as upper limits on the W’...
Two highly segmented NOvA scintillation detectors, separated by 810 km and located in the path of the NuMI neutrino beam produced at Fermilab, are optimized to study the neutrino oscillation phenomenon. At the same time, the larger Far detector (FD) with its 4,000 m2 surface area is capable to search for the exotic low-mass magnetic monopoles, and to monitor flux of the specific...
The Standard Model of particle physics is in remarkable agreement with most experimental data so far. However, a lot of questions remain unanswered, such as the origin of neutrino masses or the need for extra sources of CP violation. Possible solutions rest on scalar sector extensions, popular beyond-the-Standard-Model scenarios, in which the addition of scalar triplets is an attractive...
The state of polarization is encoded in the elements of density matrix and for a massive spin-one particle the density matrix can be parametrized in terms of 8 independent parameters called polarization parameters. We show how the polarization parameters of the $Z$ boson can be used to study the new physics interaction at the $ZZH$ vertex at future $e^+e^-$ colliders and at the LHC. We...
The first measurement of the muon anomalous magnetic moment by the Fermilab g-2 experiment has confirmed the previous intriguing result of the BNL experiment. Their combination brings to 4.2$\sigma$ the discrepancy with the currently accepted prediction of the Standard Model. The dominant theory uncertainty is related to the leading order hadronic vacuum polarization contribution (LO-HVP),...