A5057307886- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- Space Science and Extraterrestrial Life
- Agriculture and Rural Development Research
- Electric and Hybrid Vehicle Technologies
- History and advancements in chemistry
- Atomic and Subatomic Physics Research
- Electric Motor Design and Analysis
- Engineering Applied Research
- Systems Engineering Methodologies and Applications
- Spacecraft Design and Technology
University of Warsaw
2015-2024
Consejo Superior de Investigaciones Científicas
2013-2017
Universidad Autónoma de Madrid
2013-2017
Instituto de Física Teórica
2013-2015
Deutsches Elektronen-Synchrotron DESY
2011-2013
Durham University
2010-2011
University of Bonn
2010
Motivated by the recent diphoton excesses reported both ATLAS and CMS collaborations, we suggest that a new heavy spinless particle is produced in gluon fusion at LHC decays to couple of lighter pseudoscalars which then decay photons. The resonances could arise from strongly interacting sector Standard Model gauge bosons only via corresponding Wess-Zumino-Witten anomaly. We present detailed recast newest 13 TeV data together with 8 scan consistency parameter space for those resonances.
The Compact Linear Collider (CLIC) is a mature option for the future of high energy physics. It combines benefits clean environment $e^+e^-$ colliders with operation at centre-of-mass energies, allowing to probe scales beyond reach Large Hadron (LHC) many scenarios new This places CLIC project privileged spot in between precision and frontiers, capabilities that will significantly extend knowledge on both fronts end LHC era. In this report we review revisit potential search, directly...
Motivated by the recent diphoton excess reported both ATLAS and CMS collaborations, we provide a model-independent combination of results obtained at $\sqrt{s}=8$ 13 TeV LHC. We consider resonant s-channel production spin-0 spin-2 particle with mass 750 GeV that subsequently decays to two photons. The size appears be in slight tension other measurements under hypothesis.
A key research question at the Large Hadron Collider (LHC) is test of models new physics. Testing if a particular parameter set such model excluded by LHC data challenge: It requires time consuming generation scattering events, simulation detector response, event reconstruction, cross section calculations and analysis code to against several hundred signal regions defined ATLAS CMS experiment. In BSM-AI project we attack this challenge with approach. Machine learning tools are thought...
We propose an NMSSM scenario that can explain the excess in diphoton spectrum at 750 GeV recently observed by ATLAS and CMS. show a certain limit with very light pseudoscalar one reproduce experimental results without invoking exotic matter. The is produced two resonant heavy Higgs bosons masses ~750 GeV, subsequently decay to pseudoscalars. Each of these decays collimated photon pairs appear as single electromagnetic calorimeter. A mass gap between Higgses mimics large width peak....
The idea of "Natural SUSY", understood as a supersymmetric scenario where the fine-tuning is mild possible, reasonable guide to explore phenomenology. In this paper, we re-examine issue in context MSSM including several improvements, such mixing conditions for different soft terms and presence potential extra fine-tunings that must be combined with electroweak one. We give tables plots allow easily evaluate corresponding naturalness bounds any theoretical model defined at high-energy (HE)...
With the increasing usage of machine-learning in high-energy physics analyses, publication trained models a reusable form has become crucial question for analysis preservation and reuse. The complexity these creates practical issues both reporting them accurately ensuring stability their behaviours different environments over extended timescales. In this note we discuss current state affairs, highlighting specific focusing on most promising technical strategic approaches to ensure...
The work contained herein constitutes a report of the ``Beyond Standard Model'' working group for Workshop "Physics at TeV Colliders", Les Houches, France, 26 May--6 June, 2003. research presented is original, and was performed specifically workshop. Tools calculations in minimal supersymmetric standard model are presented, including comparison dark matter relic density predicted by public codes. Reconstruction particle masses LHC future linear collider facility examined. Less orthodox...
A bstract Recent ATLAS and CMS measurements show a slight excess in the W + − cross section measurement. While still consistent with Standard Model within 1−2- σ , could be also first hint of physics beyond Model. We argue that this effect attributed to production scalar top quarks supersymmetric models. The stops $ {m_{{{{{\widetilde{t}}}_1}}}}\sim 200 GeV has right pair-production under some assumptions can significantly contribute final state two leptons missing energy. scan region...
A number of LHC searches now display intriguing excesses. Most prominently, the measurement W + − cross-section has been consistently ∼ 20% higher than theoretical prediction across both ATLAS and CMS for 7 8 TeV runs. More recently, supersymmetric final states containing two or three leptons have also seen more events predicted in certain signal regions. We show that a model light stop, winos binos can match data. perform fit to all measurements may be sensitive our find reduction...
Abstract We present a deep learning solution to the prediction of particle production cross sections over complicated, high-dimensional parameter space. demonstrate applicability by providing state-of-the-art predictions for charginos and neutralinos at Large Hadron Collider (LHC) next-to-leading order in phenomenological MSSM-19 explicitly performance $$pp\rightarrow \tilde{\chi }^+_1\tilde{\chi }^-_1,$$ <mml:math...
Current experimental constraints on a large parameter space in supersymmetric models rely the missing energy signature. This is usually provided by lightest neutralino which stability ensured R-parity. However, if R-parity violated, decays into standard model particles and cut not efficient anymore. In particular, UDD type violation induces decay to three quarks potentially leads most difficult signal be searched at hadron colliders. this paper, we study violating using same-sign dilepton...
A bstract We study the impact of multi-lepton searches at LHC on supersymmetric models with compressed mass spectra. For such acceptances usual search strategies are significantly reduced due to requirement large effective and $ E_T^{\mathrm{miss}} . On other hand, lepton do have much lower thresholds for p T final state objects. Therefore, if a model spectrum allows states, one could derive constraints using searches. class simplified we exclusion limits ATLAS analyses states containing 2-4...
As we anticipate the first results of 2016 run, assess discovery potential LHC to ``natural supersymmetry.'' To begin with, explore region model parameter space that can be excluded with various center-of-mass energies (13 TeV and 14 TeV) different luminosities ($20\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, $100\text{ $300\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ $3000\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$). We find bounds at 95% C.L. on stops vary from...
We point out that there is a parameter region in supersymmetry with heavy scalars and higgsinos, which the heavier of bino wino becomes long-lived as consequence higgsinos. In this these electroweak gaugino sectors are secluded from each other very small mixings inversely proportional to higgsino mass, μ. revisit decays provide simple formulae for partial decay rates lifetimes limit The scale μ required gauginos highly depends on mass hierarchy between wino. neutral can be (cτ ≳ 1cm) even...
If signals of new physics are discovered at the LHC it will be crucial to determine spin structure model. We discuss a method that can help address this question with low integrated luminosity, L=1 fb^-1, sqrt{s}=14 TeV. Based on differences in angular distributions primarily produced particles we show significant difference observed final state jet-pairs rapidity distance. An additional advantage is does not rely any particular couplings decay chain. simulate samples for models...
Checkmate is a framework that allows the user to conveniently test simulated BSM physics events against current LHC data in order derive exclusion limits. For this purpose, runs through detector simulation and then processed by chosen number of experimental analyses. These analyses are all defined signal regions can be compared with multitude statistical tools. Due large continuously growing available, users may quickly find themselves situation study they particularly interested has not...
If light supersymmetric top (stop) quarks are produced at the LHC and decay via on- or off-shell W-bosons they can be expected to contribute a precision W+W− cross section measurement. Using latest results of CMS experiment, we revisit constraints on stop quark production find that this measurement exclude portions parameter space not probed by dedicated searches. In particular squarks up 230 GeV along line separating three- four-body decays, t˜1→χ˜10W(⁎)b. We also study exclusion limits in...