We have all heard the story; classical physics supposedly predicts that the intensity of emitted radiation from a blackbody diverges in the ultraviolet and that is why Planck introduced the quanta of light.
This story, however, is a myth fabricated long after the historical events. The ultraviolet catastrophe was not coined until 1911 and its origin dates back to 1905; five years after...
The Any Light Particle Search II (ALPS II) experiment searches for axions and axion-like particles (ALPs) in an important parameter space that is relevant in understanding anomalous astrophysical phenomena, including stellar evolution. ALPS II takes advantage of the axion coupling to photons using a resonantly enhanced Light-Shining-through-a-Wall (LSW) technique. Photons created using a...
Future detector systems have increasing demands on the performance of their mechanical support structures and cooling systems. Novel materials and cooling technics are developed and continuously improved in order to fulfil these requirements. To quantify the thermal performance of these materials, a custom thermal conductivity measurement setup was developed.
The setup consists of two heat...
The KATRIN experiment aims to measure the neutrino mass by precision spectroscopy of tritium β-decay. Recently, KATRIN has improved the upper bound on the effective electron-neutrino mass to 0.8 eV/c² at 90% confidence level [1] and is continuing to take data for a target sensitivity of 0.2 eV/c².
In addition to the search for the neutrino mass, the ultra-precise measurement of the β-spectrum...
Graph Neural Networks-based algorithms are suitable candidates for the efficiency optimization of flavour tagging in High Energy Physics (HEP) research at colliders. The identification of jets originating from b- and c-quarks (flavour tagging) is crucial for many analyses, including searches beyond the Standard Model (SM) signatures and measurements of the properties of SM particles. Each jet...
Measuring the production of $W$-boson pairs at particle colliders provides an important test of the predictions of the Standard Model (SM) of particle physics in both perturbative quantum chromodynamics and electroweak domains. In this measurement, fiducial and differential cross sections are obtained using the full Run 2 dataset collected in proton-proton collisions at the LHC at a...
A new type of radio frequency timer of keV energy electrons will be presented. It is based on a helical deflector, which performs circular or elliptical sweeps of keV electrons, by means of radio frequency fields in a frequency range of 500–1000 MHz. By converting a time distribution of incident electrons to a hit position distribution on a circle or ellipse, this device achieves extremely...
The strategies for and the performance of the CMS tracker alignment during the ongoing Run 3 data-taking period are described. The results of the very first tracker alignment for Run 3 data reprocessing performed with cosmic rays and collision tracks recorded at the unprecedented center of mass energy of 13.6 TeV are presented. Also, the performance after deployment of a more granular...
New pseudoscalar (A) and scalar (H) states are predicted by many models with an extended Higgs sector, such as two-Higgs Doublet Models (2HDMs), which add a second Higgs doublet to the SM. In 2HDMs of type II, these states decay predominantly to ttbar, provided that they are massive enough (m > 400 GeV) and that the ratio between the vacuum-expectation-values of the two Higgs doublets ($\tan...
The field emission effect is a serious problem that degrades the performance of superconducting cavities. Metallic contaminants, surface curvature, and insufficient surface cleaning can cause electron emission. Field emission typically occurs at the GeV-scale, but it can be also observed within the MeV-scale electric field of superconducting cavities. This is because metallic contaminants can...
LUXE (Laser Und XFEL Experiment) is a proposed experiment at DESY using the electron beam of the European XFEL and a high-intensity laser. The experiment’s primary aim is to investigate the transition from the well-probed perturbative to the non-perturbative Quantum Electrodynamics regime.
In LUXE, positrons are generated and directed towards a four-layered silicon pixel detector, with...
The ATLAS Forward Proton Time-of-Flight detector: use and projected performance for LHC Run 3 The Time-of-Flight (ToF) detectors of the ATLAS Forward Proton (AFP) system are designed to measure the primary vertex z-position of the pp -> pXp processes by comparing the arrival times measured in the ToF of the two intact protons in the final state. We present the results obtained from a...
Particle cascades originating from quarks and gluons decays (jets) are omnipresent in proton-proton collisions at the LHC. The identification of jet flavours is essential for many physics searches at the ATLAS experiment. This is achieved using machine learning algorithms (taggers) which combine tracks and jets information to determine the flavour of the jets (b-jets, c-jets and light jets)....
In this talk, we present the remarkable accomplishments of the AMS INFN Roma Sapienza research group over the past three years, focusing on their active involvement in astroparticle experiments and the exploration of the symbiotic relationship between astroparticle experiments and space radiobiology. The group's significant contributions to the field will be presented. The AMS research group...
The LHC physics program requires a robust and efficient reconstruction of the trajectories of charged particles, as well as precise measurement of primary and secondary vertices and impact parameters. The radiation damage introduced by high particle fluxes at the interaction region is also to be considered, given its influence on the particle position measurements. In order to exploit the...
The CMS silicon tracker consists of two tracking devices: the inner pixel and the outer strip detectors. The tracker occupies the region around the center of CMS, where the LHC beams collide, and therefore, operates in a high-occupancy and high-radiation environment produced by the particle collisions within the LHC tunnel.
This poster summarizes the tracker performance during the ongoing...
Measurements of two- and multi-particle azimuthal correlations provide valuable information on the properties of the system created in collisions of hadrons and nuclei at high energy. In particular, they revealed an unexpected collective behaviour in small collision systems similar to the one exhibited by the quark-gluon plasma in heavy-ion collisions. The origin of collectivity in small...
Constraints on the Higgs boson self-coupling are set by combining the double-Higgs boson analyses with the single-Higgs boson analyses. The data used by these analyses were recorded by the ATLAS detector at the LHC in proton-proton collisions at sqrt(s) = 13 TeV and corresponds to an integrated luminosity of 126-139/fb. The combination of the double-Higgs analyses sets an upper limit at 95%...
The Compact Muon Solenoid (CMS) detector is currently undergoing a Phase-2 upgrade, in preparation for operation in the High-Luminosity LHC. Once upgraded, the CMS will incorporate a completely new tracker. The pixel chips for the Inner Tracker are developed by the RD53 collaboration.
In this poster, we will present the latest calibration test results for the RD53B-CMS (CROC_v1) chips with...
We present a new theory to predict dark matter (DM) particle mass, size, lifetime, and properties of possible dark radiation from DM particle decay. In the dynamics of self-gravitating collisionless dark matter, the existence of inverse mass and energy cascade from small to large scales facilitates the hierarchical structure formation. A scale-independent constant rate of energy cascade...
The FCC-ee is a proposed future $e^+e^-$ collider capable of producing an unparalleled number of Higgs, Z, and W bosons, as well as of top quarks, in very clean experimental conditions. Up to four experiments can detect the collision products, with IDEA being one of the proposed detector concepts. A plethora of measurements at the FCC-ee rely on precise and accurate measurements of bottom and...
The CMS collaboration has chosen a novel high granularity calorimeter (HGCAL) to instrument the endcap regions as part of its upgrade for the high luminosity LHC. The HGCAL will have fine segmentation in both the transverse and longitudinal directions and will be the first such calorimeter specifically optimised for particle flow reconstruction to operate at a colliding-beam experiment. The...
The High-Luminosity LHC will open an unprecedented window on the weak-scale nature of the universe, providing high-precision measurements of the Standard Model (SM) as well as searches for new physics beyond the SM. The CMS Collaboration is planning to replace entirely its trigger and data acquisition systems to match this ambitious physics program. Efficiently collecting datasets in Phase 2...
In the Belle II experiment, which uses data from the electron-positron collision at the SuperKEKB accelerator, a hardware trigger is used to reduce a readout rate and data size. The track trigger reconstructs three-dimensional tracks using signals from the Central Drift Chamber. The trigger system is composed of FPGAs to meet requirements: latency < 4.5 us, trigger rate < 30 kHz, and trigger...
In recent times several signatures of beyond standard model (SM) physics have appeared in a number of observables related to the semi-leptonic decays of B mesons. Further, the magnetic moment of muon also shows deviation from SM at the level of 4 sigma. A number of proposed new physics models can accommodate these anomalies. A class of these models also contain dark matter (DM) candidates. We...
Vector boson scattering is one of the recent remarkable observations at the Large Hadron Collider. The longitudinal polarization modes of the massive vector bosons are strongly tied to the electroweak symmetry breaking mechanism. With the Standard Model predicted Higgs boson playing a crucial role in regularizing the scattering amplitude of these longitudinally polarized bosons, vector boson...
Steering of high-energy particle beam can be achieved by exploiting channeling in bent crystals. Indeed, the atomic planes of a crystal lattice aligned with incoming particles acts similarly to a waveguide and deliver deflection equivalent to hundreds of Tesla magnetic dipole. This effect was investigated and exploited in accelerators since the 70s and is being currently tested at CERN as a...
Utilising data from the direct detections of compact binary coalescences (CBCs) in the first three observing runs of the LIGO-Virgo-KAGRA Collaboration (LVK), we estimate the redshift dependence of the binary black hole (BBH) population. Specifically, we search for signs that the mass distribution of BBHs varies over cosmic history. The detection of such variation would allow us to gain more...
Deviations of the measured LFU ratios such as $R_{D^{(*)}}$ and $R_{J/ \psi}$ from the standard model predictions by $3.2\sigma$ and $1.8\sigma$, respectively, indicate the possible existence of new physics beyond the standard model. Precise measurements of other observables in decays involving $b\to c\bar{\ell}\nu_\ell$ transitions in the future may substantiate or rule out the presence of...
The PUNCH4NFDI Consortium in the German NFDI represents the particle, astroparticle, astro-, hadron and nuclear physics communities and has as its central deliverable a community-overarching science data platform SDP, in which complex workflows can be executed on digital research products in a transparent, automatised and FAIR (Findable, Accessible, Interoperable, and Reusable) way. The SDP...
As prerequisite to any physics exploration excellent performances of physics object are essential ingredients to a successful scientific programme. Electrons and Photons play a crucial role at LHC in several fields. Several analyses such as SM precision measurements, measurements in the Higgs sector, and searches for processes beyond the SM, rely on excellent electron and photon...
In recent years, high-gradient, symmetric focusing with active plasma lenses has regained significant interest due to its potential advantages in compactness and beam dynamics compared to conventional focusing elements. A promising application could be optical matching of highly divergent positrons from the undulator-based ILC positron source into the downstream accelerating structures to...
The identification of jets containing b-hadrons is key to many physics analyses at the LHC, including measurements involving Higgs bosons or top quarks, and searches for physics beyond the Standard Model. In this contribution, the most recent enhancements in the capability of ATLAS to separate b-jets from jets stemming from lighter quarks will be presented. The improved performance originates...
As the first gravitational wave observatory of the third generation, the future Einstein Telescope (ET) aims to improve current sensitivities by at least one order of magnitude over the whole detection band. Specifically, in the low-frequency band below 10 Hz, gravity-gradient noise caused by seismic perturbations is anticipated to be the limiting noise contribution. Therefore, the underground...
The Cosmic Background (CB) is defined as the isotropic diffuse radiation field with extragalactic origin. Different astrophysical sources dominate the CB emission at different energies, such as stars in the optical or active galactic nuclei in X-rays. Assuming that dark matter consists of axions with masses on the order of electron volts or higher, we expect an additional contribution to the...
The particle physics community has concluded that the next collider should be an e+ e- Higgs factory. Such a collider would also enable many other precision measurements, e.g. of the top quark and in the electroweak sector, as well as searches for exotic particles. In the ongoing discussions it has become increasingly clear that particle identification including charged hadron ID is a key...
We study the CP-even neutral Higgs boson decays $h \to c \bar{c}, b \bar{b}, \gamma \gamma, g g$ in the Minimal Supersymmetric Standard Model (MSSM) with general quark flavor violation (QFV), identifying the h as the Higgs boson with a mass of 125 GeV. We compute the width ratios of these h decays focusing on their deviations from the standard model (SM) predictions. We perform a...
With the ambition to maintain competitiveness of European accelerator-based research infrastructures and to enable Europe’s Green Deal, it has been proposed to Innovate for Sustainable Accelerating Systems (iSAS) [1]. iSAS aims to broaden, expedite and amplify the development and impact of novel energy-saving technologies to accelerate particles with enhanced collaborations. Presently, the...
For the planned International Linear Collider (ILC) a material for the positron source is needed, which can withstand the high energy deposition needed for a high luminosity positron source. To distribute the load and keep the target at a reasonable temperature, the target is rotated. Therefore, the material must also withstand the mechanical load during the simultaneous cyclical thermal load....
The multipurpose JUNO Experiment located in China, whose central detector uses 20 kt liquid scintillator, is on track to completion of construction in 2023. Its primary goal is to determine the Neutrino Mass Ordering by leveraging its large target mass and excellent energy resolution of 3% at 1 MeV. The unique properties of JUNO position it to have a large potential for real-time solar...
The JUNO-TAO detector is a satellite detector of the Jiangmen Underground Neutrino Observatory (JUNO) and it will be placed near the core of the Taishan nuclear power plant. It is a liquid based scintillator that will provide a precise measurement of the nuclear antineutrino spectra improving the sensitivity of JUNO on the correct mass ordering studies. Furthermore, JUNO-TAO will provide...
Kassiopeia is an object-oriented software package written in C++ to simulate particle tracks in complex geometries under the influence of static electromagnetic fields. Featuring a comprehensive set of functionalities, it has originally been developed to satisfy the requirements of the KATRIN neutrino mass experiment.
An open-source version of Kassiopeia was published on github in 2013,...
Studies associated with neutrinos are now at the center stage of high energy physics search to decipher the signal of physics beyond the standard model. With the next generation neutrino experiments neutrino physics may enter the precision era. However, neutrino oscillations in the matter could get affected by the sub-dominant, yet unknown, non-standard interactions. The long-baseline (LBL)...
In particle physics, Monte Carlo (MC) event generators are needed to compare theory to the measured data. Many MC samples have to be generated to account for theoretical systematic uncertainties, at a significant computational cost. Therefore, the MC statistic becomes a limiting factor for most measurements and the significant computational cost of these programs a bottleneck in most physics...
The machine learning techniques to predict unitarity and bounded from below (BFB) constraints in multi-scalar models is employed. The effectiveness of this approach is demonstrated by applying it to the two and three Higgs doublet models, as well as the left-right model. By employing suitable neural network architectures, learning algorithms, and carefully curated training datasets, a...
The azimuthal decorrelation angle ∆φ between the leading jet and scattered lepton in deep inelastic scattering has been measured with the ZEUS detector at HERA.The experimental data set was taken in the HERA II data-taking period and corresponds to an integrated luminosity of 326 pb-1. The measurement was performed within a range of the exchanged photon virtuality Q2 from 10 to 350 GeV2, the...
We present a measurement of the jet mass distribution in fully hadronic decays of boosted top quarks with full Run 2 data. The measurement is performed in the lepton+jets channel of top quark pair production. The top quark decay products of the all-hadronic decay cascade are reconstructed with a single large-radius jet with transverse momentum greater than 400 GeV. The top quark mass is...
This work examines the decay spectrum of top quark produced via the t-channel production mechanism. The vast quantity of data collected by ATLAS during run-2 allows for an unique opportunity to study the top quark via this production mechanism. Here the top quark is produced via an electroweak interactions and thus top quarks are produced polarized. Therefore it is a unique channel to study...
A measurement of the top quark pole mass in events where a top quark-antiquark pair ($\text{t}\bar{\text{t}}$) is produced in association with at least one additional jet ($\text{t}\bar{\text{t}}$+jet) is presented. This analysis is performed using proton-proton collision data at 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to a total integrated luminosity of 36.3...
In this poster we present the latest measurement of ttH production in the final state where the Higgs boson decays to a b-bbar pair, performed by CMS with data from pp collisions at 13 TeV, as well as prospects for this measurement at the High Luminosity LHC.
Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to photon-induced processes. Measurements of photon-induced production of tau lepton pairs can be used to constrain the tau lepton's anomalous magnetic dipole moment (g-2). This work presents a recent ATLAS measurement using muonic decays of tau leptons in association with electrons and...
Determining the number of collisions delivered by the LHC inside the ATLAS detector is a key part of the ATLAS luminosity program. Several sub-detectors and algorithms are used, among which is the track counting method. This method assumes that the number of charged particle tracks reconstructed from the ATLAS Inner Detector is proportional to the number of simultaneous collisions, thereby...
The NaNu experiment aims to study muon and tau neutrino interactions in the energy range of 10-60 GeV at the CERN SPS collider and consists of two detector components. The passive detector component of NaNu will utilise emulsion detector planes interleaved with tungsten absorber plates and MicroMegas detectors. The active detector will employ an array of MicroMegas detectors equipped with...
In this talk, I will introduce a novel formalism for any field theory and apply it to the effective field theories of large-scale structure. The new formalism is based on functors of actions composing those theories. This new formalism predicts the actionic fields.
Furthermore, I will discuss a generalised manifold with N-correlators of Nt- objects with or without contaminants.
I will...
In the hunt for new physics phenomena, such as dark matter, it is
crucial to compare experimental data to theoretical models. During this
step, the most likely values of the model’s parameters — such as particle
masses and cross sections — are inferred. However, a rigorous statistical
treatment of such an inference is oftentimes not practically feasible with-
out making significant...
The High Luminosity Large Hadron Collider (HL-LHC) at CERN is expected to collide protons at 14 TeV center-of-mass energy and to reach the unprecedented peak instantaneous luminosity of 7.5 x 10^34 cm^-2 s^-1 with an average number of pileup events of 200. This will allow the ATLAS and CMS experiments to collect integrated luminosities up to 4000 fb^-1 during the project’s lifetime. To cope...
Muon selection and identification represent a key aspect for many analyses at CMS, either to select the signal final state or to reject background events. We present two multivariate techniques that have been developed for a highly efficient muon identification. One has been trained to distinguish muons either produced promptly in the decay of bosons or nonprompt muons from tau lepton or heavy...
We report various energy reconstruction algorithms used by the CMS hadron calorimeter (HCAL) during Run 2 of the LHC. During Run 2, the characteristic bunch-crossing spacing for proton- proton collision was 25 ns, which resulted in overlapping signals from adjacent crossings. The energy corresponding to a particular bunch crossing of interest can be estimated using the known pulse shapes of...
A precise measurement of the luminosity is a crucial input for many ATLAS physics analyses, and represents the leading uncertainty for W, Z and top cross-section measurements. The ATLAS luminosity measurement depends on the interplay of a set of complementary luminometers, based on specific subdetectors, such as LUCID-2, or the ATLAS track and calorimeter subsystems. The LUCID-2 detector was...
The CMS inner tracking system, responsible for measuring the trajectories of charged particles, consists of a silicon pixel detector and a silicon strip detector. The CMS two-tier trigger system, used to select events of interest, consists of a hardware-based Level-1 trigger and a software-based High-Level Trigger (HLT). The HLT runs a version of the full event reconstruction, streamlined for...
Non-minimal simplified extensions of the Standard Model have gained considerable currency in the context of dark matter searches at the LHC, since they predict
enhanced mono-Higgs and mono-W/Z signatures over large parts of the parameter space.
However, these non-minimal models obviously lack the simplicity and directness of the
original simplified models, and are more heavily dependent on...
The radio galaxy Messier 87 (M87) has an active galactic nucleus which enables us to observe it at very high energy gamma rays. Photons from M87 have been observed at up to a few 10s of TeV using the H.E.S.S. telescope array. During monitoring campaigns and target of opportunity observations, several high flux states could be identified, which allow us to probe the Extragalactic Background...
The flavor symmetry-breaking scale in the Froggatt-Nielsen (FN) mechanism is very weakly constrained by present experiments and can lie anywhere between a few TeVs and the Planck scale. We construct two ultraviolet-complete models that generate the FN mechanism, with a global $U(1)_{\rm{FN}}$ flavor symmetry and a single flavon field. Using the one-loop finite temperature effective potential,...
We investigate the potential of the ratios $R_{\tau \mu}$ in $B \to K \ell \ell$ and $B \to K^* \ell \ell$ decays ($\ell=\mu,\,\tau$) to probe new physics in the $\tau-\mu$ sector. We find that this ratio deviates from their SM prediction even for universal couplings. This implies that the bare deviation of these ratios from their SM predictions cannot confirm the nature of possible new...
Double-Higgs (HH) production in the LHC is one of the main sought-after measurements, as it is a direct probe of the Higgs self-coupling originating from the Higgs potential. I propose a poster presenting the search for HH production in the bottom-quark and tau-lepton pairs decay channel. I focus on the full run-2 analysis, covering the strategy employed to distinguish this complex final state...
Atmospheric neutrinos offer the possibility of exploring the internal structure of Earth. This information is complementary to the traditional probes of seismic and gravitational studies. While propagating through Earth, the multi-GeV neutrinos encounter the Earth’s matter effects due to the coherent forward scattering with the ambient electrons, which alters the neutrino oscillation...
The e+e- collisions at the Z-pole energy at the Future Circular Collider (FCC) present trillions of B-hadrons of all species in a clean experimental environment. The purely leptonic $B^+_c \to \tau^+ \nu_\tau$ and $B^+ \to \tau^+ \nu_\tau$ decays provide excellent probes of the $b \to q \tau \nu$ transition, complementary to the semileptonic decay modes. The prospects of precise measurements...
The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation large liquid-scintillator neutrino detector. Its primary goal is the determination of neutrino mass ordering (NMO). JUNO's main sensitivity to NMO comes from reactor neutrino measurements. However, high-energy (GeV level) atmospheric neutrino measurements can also independently probe NMO, potentially enhancing JUNO's...
The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino experiment currently under construction in southern China, in an underground laboratory with approximately 650 m of rock overburden.
The detector consists of a 20 kton liquid scintillator target, contained inside a 35.4-meter-diameter spherical acrylic vessel. The sphere is submerged in an ultra-pure water pool,...
The Deep Underground Neutrino Experiment (DUNE) is a long-baseline neutrino oscillation experiment with a 70kt liquid argon time projection chamber (LAr TPC) at the Far Detector complex at the Sanford Underground Research Facility (SURF) and a Near Detector (ND) complex planned for the Fermi National Accelerator Laboratory. The ND complex plans for three detector subsystems, including a...
The Phase-2 upgrade of the CMS detector for the high luminosity era of the LHC, will install a new tracking system to cope with the increased pileup and track multiplicity. The inner layers of the outer tracker will be equipped with pixel-strip (PS) modules that have a high segmentation to provide an accurate position measurement. A PS module contains two types of silicon sensors, namely,...
Measurements in pp and p--Pb collisions, so-called small systems, besides serving as baseline for studying vacuum production and cold-nuclear matter effects, respectively, have recently shown intriguing features. In particular, measurements in high-multiplicity events have revealed striking similarities with heavy-ion collisions, where the formation of a quark-gluon plasma is expected. One of...
Silicon sensor based particle detectors operated in an hadronic radiation environment need to be cooled to counteract the radiation induced leakage current and prevent thermal runaway. To achieve this most efficiently, a low thermal resistance is required between the detector modules and the cooling structures. In many cases dry thermal contacts are sufficient, but especially for large area...
The Jiangmen Underground Neutrino Observatory (JUNO) is a neutrino experiment under construction with a broad physics program. The main goals of JUNO are the determination of the neutrino mass ordering and the high-precision measurement of neutrino oscillation properties with anti-neutrinos produced in commercial nuclear reactors. High-quality reconstruction of reactor neutrino energy is...
Vector boson scattering is a key production process to probe the electroweak symmetry breaking of the standard model, since it involves both self-couplings of vector bosons and coupling with the Higgs boson. If the Higgs mechanism is not the sole source of electroweak symmetry breaking, the scattering amplitude deviates from the standard model prediction at high scattering energy. Moreover,...
The CMS electromagnetic calorimeter (ECAL) consists of more than 75,000 lead tungstate crystals located inside the magnetic field of the CMS solenoid magnet. The combined effect of the magnetic field and the material between the collision point and the ECAL leads to electrons and photons depositing their energy over several crystals. To achieve the best energy resolution it is essential to...
At the CMS experiment, a growing reliance on the fast Monte Carlo application (FastSim) will accompany the high luminosity and detector granularity expected in Phase 2. The FastSim chain is roughly 10 times faster than the application based on the GEANT4 detector simulation and full reconstruction referred to as FullSim. However, this advantage comes at the price of decreased accuracy in some...
It seems that the literature suggests to go in two opposing directions simultaneously. On the one hand, many papers construct basis-independent quantities, since exactly these quantities appear in the expressions for observables. This means that the mixing angles such as $\tan \beta$ in the Two Higgs Doublet Model must drop out when calculating anything physical. On the other hand, there are...
A search for new physics in top quark production with additional final-state leptons is performed with 138 fb^(-1) of proton-proton collisions at sqrt(s) = 13 TeV, collected by the CMS detector during 2016, 2017, and 2018. The search is performanced within the context of an effective field theory (EFT) framework, which parametrizes potential new physics effects in terms of 26 dimension-six EFT...
We present a new search for hypothetical massive, charged, long-lived particles with the ATLAS detector at the LHC using an integrated luminosity of 140 fb-1 of proton???proton collisions at sqrt(s) = 13 TeV. These particles are expected to move significantly slower than the speed of light and should be identifiable by their high transverse momenta and anomalously large specific ionisation...
A search is presented for Higgs boson pair production (HH) associated with a vector boson V (W or Z boson) with 138 fb^−1 of proton-proton (pp) collisions at a center-of- mass energy of 13 TeV with the CMS detector at the LHC at CERN. The processes in this search include ZHH and WHH production. All hadronic decays and leptonic decays of W and Z bosons involving electrons, muons, and neutrinos...
The searches for Lepton Flavour Violation (LFV) in the top quark sector at sqrt(s) =13 TeV is presented. The analysis is performed using the data collected by CMS Experiment from 2016 to 2018 corresponding to the 139 fb^(-1) of integrated luminosity. The analyses exploit the use of machine learning techniques to distinguish signal and background. Upper limits on the LFV signals in the up and...
The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to determine the effective electron antineutrino mass with a nominal sensitivity of $0.2\,\mathrm{eV}c^{-2}$. This is achieved by a direct kinematic approach, where the mass square $m_\nu^2$ is inferred from the shape of the electron energy spectrum of molecular tritium beta decay. The unique experimental setup allows for...
Searches for new resonances in two-body invariant masses are performed using an unsupervised anomaly detection technique in events produced in $pp$ collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the LHC. An autoencoder network is trained with 1% randomly selected collision events and anomalous regions are then defined which contain events with high...
Supersymmetry remains one of the most popular Beyond Standard Model theories proposing solutions to the limitations of the Standard Model, e.g. the naturalness problem and the lack of a viable dark matter candidate. However, the lack of signs for supersymmetric particles at the LHC imposes strong constraints on the simplest versions of supersymmetry. One natural solution is to abandon the...
Since the discovery of the Higgs boson in 2012, a priority of the ATLAS and CMS Collaborations has been to better understand its properties and couplings, including those fundamental parameters that are related to interactions involving multiple Higgs bosons. A direct probe of the Higgs boson trilinear self-coupling is possible via Higgs boson pair production, making di-Higgs analyses...
This poster presents a search for lepton-flavor violating decays of the Higgs boson to an electron-muon pair using data from proton-proton collisions at √s = 13 TeV collected by the CMS experiment at the LHC. The dataset corresponds to an integrated luminosity of 138 fb−1. No significant excess of events is observed for the 125 GeV Higgs, leading to the most stringent upper limits so far on...
Till today, although the Standard Model (SM) is the most celebrated theory that explains nature almost completely, there are still some phenomena observed in nature that the SM cannot explain. That is why it is needed to look for theories beyond the Standard Model (BSM). While the ATLAS/CMS experiments discovered a Standard Model-like Higgs boson at the Large Hadron Collider (LHC), no...
A dedicated search for anomalous Higgs boson decays into two axion-like-particles (ALPs) is presented, using the full Run-2 data-set recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to various recently proposed models that could explain the famous g-2 discrepancy. This poster presents details of the search in the mass range of ALPs between...
Neutrino-oscillations motivate the search for new beyond-the-Standard-Model particles that might manifest as light scalar bosons mediating lepton-flavor-changing (LFC) interactions. In a certain class of theories, the light scalar boson could be produced at accelerator neutrino beams [1], where a high-intensity, high-energy muon flux is expected. An example of such a facility is the Deep...
Top quark pair production processes at the LHC are important for precision measurements of observables such as the top quark mass or top quark pair spin correlations and as a background for BSM searches. As such, it is crucial that MC simulation of this process is available for experimental analyses at the highest level of precision possible.
Here, we show an investigation of the NLO MC...
The Mu2e experiment at the Fermilab will search for a coherent neutrinoless conversion of a muon into an electron in the field of an aluminum nucleus
with a sensitivity improvement by a factor of 10,000 over existing limits.
The Mu2e Trigger and Data Acquisition System (TDAQ) uses \emph{otsdaq} framework as the online Data Acquisition System (DAQ) solution.
Developed at Fermilab,...
This poster presents the status of the searches and measurements of a Higgs boson decaying to a tau lepton pair using the data collected by the CMS experiment from 2016 to 2018. Since the observation of the Higgs boson decaying to a tau lepton pair by the CMS Collaboration in 2018 many analyses used this final state to make new measurements or to search for different production modes of the...
The future electron-positron colliders offer excellent facilities for SUSY
searches. With respect to previous e+e- colliders, they increase the luminosity
and centre-of-mass energy and improve the technologies, while, with
respect to hadron colliders, they offer a cleaner environment, a known
initial state and a triggerless operation of the detectors.
Moreover, in contrast to hadron...
SUPAX is one of the first RF cavity based haloscope experiments in Germany to search for axions. Axions could solve the well known strong CP problem and may explain the dark matter content of the universe.
Axions are expected to convert to photons in the presence of a strong magnetic field, where the photon frequency depends on the axions mass. For wavelengths in the microwave regime...
Sustainability is an increasingly important topic in the public discourse, and has become a prioritized goal in the design, planning and implementation of future accelerators; approaches to improved sustainability range from overall system design, optimization of subsystems and key components, to operational concepts. A direct quantification of the ecological footprint, be it greenhouse gas...
A search for SUSY and Dark Matter particles in association with two top quarks is presented. The supersymmetric partner of the top quark is searched for using a simplified SUSY model featuring stop pair production where each stop decays into a top quark and a neutralino, leading to a final state with two top quarks and missing transverse energy. The analysis strategy heavily uses machine...
The high-luminosity upgrade of the LHC will result in an increase of the typical instantaneous luminosity by a factor of about four. In order to cope with the new conditions, such as higher levels of radiation damage, larger pileup, and higher data load, the CMS detector will require substantial upgrades. As part of this upgrade program, the entire silicon tracking detector will be renewed....
We motivate and describe a method based on fits with polynomials to test the smoothness of differential distributions. As a demonstration, we apply the method to several measurements of inclusive jet double-differential cross section in the jet transverse momentum and rapidity at the Tevatron and LHC. This method opens new possibilities to test the quality of differential distributions used...
In view of the HL-LHC, the Phase-2 CMS upgrade will replace the entire trigger and data acquisition system. The detector readout electronics will be upgraded to allow a maximum L1 accept rate of 750 kHz, and a latency of 12.5 µs. The muon trigger is a multi-layer system that is designed to reconstruct muon stubs on each muon station and then to measure the momenta of the muon by correlating...
EAJADE („Europe-America-Japan Accelerator Development and Exchange") is a Marie Sklodowska-Curie staff exchange action under Horizon-Europe that will run for four years, starting in 2023. EAJADE addresses the urgent need of exchange of ideas on R&D and implementation of future accelerators for particle physics, in particular for a future Higgs factory, but also for generic technical...
The Adler function is one basic ingredient in the running of the QCD and QED couplings and in the muon g-2 prediction. We perform a comprehensive analysis of the Euclidean Adler function within perturbation theory at $2\,\mathrm{GeVs}$, showing how, using existing results, a consistent and precise description beyond $\mathcal{O}(\alpha_s^2)$ is possible if the study is made in an EFT-based...
The Mu2e experiment will search for charged-lepton flavor violating (CLFV) muon to electron conversion. The signal for this process is a monoenergetic electron, and so a precise momentum measurement of the outgoing electron is required to reach the experiment's target sensitivity. This is achieved in Mu2e using a low-mass cylindrical straw tracker operated in vacuum, consisting of 21,000...
Usually, effective field theories (EFTs) for axion-like particles (ALPs) are built assuming a shift symmetry for the ALP due to the global U(1) Peccei-Quinn (PQ) symmetry that is at the heart of the axion mechanism. However, it is generally believed that global symmetries, in particular axion shift symmetries, can only be approximate. Therefore, it is important to include shift-breaking...
For the HL-LHC phase, the calorimeter endcap of the CMS detector will be upgraded with a High Granularity Calorimeter (HGCAL), a sampling calorimeter that will use silicon sensors as well as scintillator tiles read out by silicon photomultipliers (SiPMs) as active material (SiPM-on-tile). The design of the SiPM-on-tile section was inspired by the CALICE AHCAL. The complete HGCAL will be...
The Jiangmen Underground Neutrino Observatory (JUNO) is currently under construction in China with its main goal to measure the neutrino mass ordering (i.e. which neutrino is lightest) using nuclear reactor antineutrinos. The main role of the Top Tracker of the JUNO Experiment is to track and perform precision reconstruction of cosmic muons passing through the JUNO detector. This will allow...
In relativistic heavy-ion collisions, the final state collectivity is characterized by the anisotropic flow, measured through flow vector estimations. Hydrodynamics calculations and experimental data show that the flow vector fluctuates as a function of particle transverse momenta event-by-event, indicating fluctuations in the initial energy density of the nuclear collisions. In heavy-ion...
The Compact Muon Solenoid (CMS) experiment implements a sophisticated two-level triggering system composed of the Level-1, instrumented by custom-design hardware boards, and a software High Level Trigger. A new Level-1 trigger architecture with improved performance is now being used to maintain high physics efficiency for the more challenging conditions experienced during Run III. The Large...
In this study, we investigate the use of state-of-the-art classifiers, including graph networks and transformer-based architectures, for anomaly detection at the Large Hadron Collider (LHC). Traditionally, these classifiers have been used primarily for classification (signal or background) tasks. However, we investigate their potential as anomaly detection algorithms with the goal of...
Semivisible jets are a novel signature of dark matter scenarios where the dark sector is confining and couples to the Standard Model via a portal. They consist of jets of visible hadrons intermixed with invisible stable particles that escape detection. In this work, we use normalized autoencoders to tag semivisible jets in proton-proton collisions at the CMS experiment. Normalized autoencoders...
