A. Grohsjean
A5005601284- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- International Science and Diplomacy
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Superconducting Materials and Applications
- Gamma-ray bursts and supernovae
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Noncommutative and Quantum Gravity Theories
- Scientific Computing and Data Management
- Radiation Therapy and Dosimetry
- Optical properties and cooling technologies in crystalline materials
Universität Hamburg
2023-2025
A. Alikhanyan National Laboratory
2022-2024
CEA Paris-Saclay
2013-2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2013-2024
Deutsches Elektronen-Synchrotron DESY
2013-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2024
Universidad Autónoma de Madrid
2024
Karlsruhe Institute of Technology
2024
Johannes Gutenberg University Mainz
2024
Institute of High Energy Physics
2022-2024
We provide an overview of the status Monte-Carlo event generators for high-energy particle physics. Guided by experimental needs and requirements, we highlight areas active development, opportunities future improvements. Particular emphasis is given to physics models algorithms that are employed across a variety experiments. These common themes in generator development lead more comprehensive understanding at highest energies intensities, allow be tested against wealth data have been...
Dark matter (DM) simplified models are by now commonly used the ATLAS and CMS Collaborations to interpret searches for missing transverse energy (ETmiss). The coherent use of these sharpened LHC DM search program, especially in presentation its results their comparison direct-detection (DD) indirect-detection (ID) experiments. However, community has been aware limitations models, particular lack theoretical consistency some them restricted phenomenology leading relevance only a small subset...
Abstract In several searches for additional Higgs bosons at the LHC, in particular a CMS search exploring decays to pairs of top quarks, $$t\bar{t}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> , and an ATLAS studying tau leptons, $$\tau ^+\tau ^-$$ <mml:msup> <mml:mi>τ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>-</mml:mo> local excesses about $$3\,\sigma $$ <mml:mn>3</mml:mn>...
We provide an overview of the status Monte-Carlo event generators for high-energy particle physics. Guided by experimental needs and requirements, we highlight areas active development, opportunities future improvements. Particular emphasis is given to physics models algorithms that are employed across a variety experiments. These common themes in generator development lead more comprehensive understanding at highest energies intensities, allow be tested against wealth data have been...
The successful operation of the Large Hadron Collider (LHC) and excellent performance ATLAS, CMS, LHCb ALICE detectors in Run-1 Run-2 with $pp$ collisions at center-of-mass energies 7, 8 13 TeV as well giant leap precision calculations modeling fundamental interactions hadron colliders have allowed an extraordinary breadth physics studies including measurements a variety processes. LHC results so far confirmed validity Standard Model particle up to unprecedented energy scales great sectors...
This is the third out of five chapters final report [1] Workshop on Physics at HL-LHC, and perspectives HE-LHC [2]. It devoted to study potential, in search for Beyond Standard Model (BSM) physics, High Luminosity (HL) phase LHC, defined as $3~\mathrm{ab}^{-1}$ data taken a centre-of-mass energy $14~\mathrm{TeV}$, possible future upgrade, Energy (HE) $15~\mathrm{ab}^{-1}$ $27~\mathrm{TeV}$. We consider large variety new physics models, both simplified model fashion more model-dependent one....
We discuss a novel signature of dark matter production at the LHC resulting from emission an additional Higgs boson in sector. The presence such is motivated simultaneously by need to generate masses particles sector and possibility relax constraints relic abundance opening up new annihilation channel. If decays into Standard Model states via small mixing with boson, one obtains characteristic large-radius jets association missing transverse momentum that can be used efficiently discriminate...
We review the main software and computing challenges for Monte Carlo physics event generators used by LHC experiments, in view of High-Luminosity (HL-LHC) programme. This paper has been prepared HEP Software Foundation (HSF) Physics Event Generator Working Group as an input to LHCC HL-LHC computing, which started May 2020.
This White Paper is an input to the ongoing discussion about extension and refinement of simplified Dark Matter (DM) models. Based on two concrete examples, we show how existing DM models (SDMM) can be extended provide a more accurate comprehensive framework interpret characterise collider searches. In first example extend canonical SDMM with scalar mediator include mixing Higgs boson. We that this approach not only provides better description underlying kinematic properties complete model...
Dark matter (DM) simplified models are by now commonly used the ATLAS and CMS Collaborations to interpret searches for missing transverse energy ($E_T^\mathrm{miss}$). The coherent use of these sharpened LHC DM search program, especially in presentation its results their comparison direct-detection (DD) indirect-detection (ID) experiments. However, community has been aware limitations models, particular lack theoretical consistency some them restricted phenomenology leading relevance only a...
A bstract Searches for dark matter produced via scalar resonances in final states consisting of Standard Model (SM) particles and missing transverse momentum are high relevance at the LHC. Motivated by dark-matter portal models, most existing searches optimized unbalanced decay topologies which recoils against visible SM particles. In this work, we show that also sensitive to a wider class characterize recently presented simplified model framework. We point out models with balanced topology...
A bstract search for new top quark interactions is performed within the framework of an effective field theory using associated production either one or two quarks with a Z boson in multilepton final states. The data sample corresponds to integrated luminosity 138 fb − 1 proton-proton collisions at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV collected by CMS experiment LHC. Five dimension-six operators...
We present an analysis of the sensitivity LHC searches for new spin-0 particles produced via gluon-fusion and decaying into top-antitop-quark ($t\bar{t}$) final states to generic axion-like (ALPs) coupled top-quarks gluons. derive limits on effective ALP Lagrangian in linear representation terms Wilson coefficients $c_{t}$ $c_{\tilde{G}}$ based existing CMS search using $35$ fb$^{-1}$ proton-proton scattering data collected at $\sqrt{s} = 13$ TeV. further investigate posssible distinctions...
In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top Electroweak factory, we propose define a set focus topics. The general reasoning proposed topics are described this document.
This note provides a comprehensive overview of tools for predicting observables in the Standard Model effective field theory (SMEFT) at both tree level and one loop using event generators. We evaluate three primary methodologies–event reweighting, separate simulation squared matrix elements, full SMEFT process simulation–focusing on their statistical performance, computational efficiency, potential biases. Each approach is assessed terms its accuracy, highlighting trade-offs between...
A bstract We present an analysis of the sensitivity current and future LHC searches for new spin-0 particles in top–anti-top-quark $$ \left(t\overline{t}\right) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfenced> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:mfenced> </mml:math> final states, focusing on generic axion-like (ALPs) that are coupled to top quarks gluons. As a first step, we derive limits effective ALP Lagrangian...
Common and community software packages, such as ROOT, Geant4 event generators have been a key part of the LHC's success so far continued development optimisation will be critical in future. The challenges are driven by an ambitious physics programme, notably LHC accelerator upgrade to high-luminosity, HL-LHC, corresponding detector upgrades ATLAS CMS. In this document we address issues for that is used multiple experiments (usually even more widely than CMS) maintained teams developers who...
Collider signatures with top quarks provide sensitive probes of dark matter (DM) production at the Large Hadron (LHC). In this article, we review results DM searches in final states conducted by ATLAS and CMS Collaborations LHC, including most recent on full LHC Run 2 dataset. We highlight complementarity other framework various simplified models DM. A reinterpretation a search context an effective field theory description scalar energy is also discussed. Finally, give outlook potential 3,...
We present an analysis of the sensitivity current and future LHC searches for new spin-0 particles in top-anti-top-quark ($t\bar{t}$) final states, focusing on generic axion-like (ALPs) that are coupled to top quarks gluons. As a first step, we derive limits effective ALP Lagrangian terms Wilson coefficients $c_t$ $c_{\tilde{G}}$ based results CMS search using $35.9$ fb$^{-1}$ data, collected at $\sqrt{s} = 13$ TeV. then investigate how production with couplings gluons can be distinguished...
This note gives an overview of the tools for predicting expectations in Standard Model effective field theory (SMEFT) at tree level and one loop available through event generators. Methods reweighting, separate simulation squared matrix elements, full SMEFT process are compared terms statistical efficacy potential biases.