A5030431060- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Anomaly Detection Techniques and Applications
- Nuclear physics research studies
- Gaussian Processes and Bayesian Inference
- Particle accelerators and beam dynamics
- International Science and Diplomacy
- Advanced Frequency and Time Standards
- Machine Learning and Data Classification
- Urinary and Genital Oncology Studies
- Data-Driven Disease Surveillance
- Spacecraft Design and Technology
- Big Data Technologies and Applications
Jožef Stefan Institute
2015-2024
University of Ljubljana
2015-2024
University of Cincinnati
2022-2024
University of Zurich
2022-2023
International Center for Advanced Studies
2022
Consejo Nacional de Investigaciones Científicas y Técnicas
2022
National University of General San Martín
2022
Université Paris-Saclay
2021
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2021
Institut National de Physique Nucléaire et de Physique des Particules
2021
B physics has played a prominent role in investigations of new effects at low-energies. Presently, the largest discrepancy between standard model prediction and experimental measurements appears branching ratio charged current mediated to tau nu decay, where large mass lifts helicity suppression arising leptonic decays. Less significant systematic deviations are also observed semileptonic D(*) rates. Due rich spin structure final state, decay mode D* offers number tests such possible...
We present the physics program of Belle II experiment, located on intensity frontier SuperKEKB $e^+e^-$ collider. collected its first collisions in 2018, and is expected to operate for next decade. It anticipated collect 50/ab collision data over lifetime. This book outcome a joint effort collaborators theorists through theory interface platform (B2TiP), an that commenced 2014. The aim B2TiP was elucidate potential impacts program, which includes wide scope topics: B physics, charm, tau,...
Present measurements of $b\ensuremath{\rightarrow}c\ensuremath{\tau}\ensuremath{\nu}$ and $b\ensuremath{\rightarrow}u\ensuremath{\tau}\ensuremath{\nu}$ transitions differ from the standard model predictions lepton flavor universality by almost $4\ensuremath{\sigma}$. We examine new physics interpretations this anomaly. An effective field theory analysis shows that minimal violating models are not preferred as an explanation, but also yet excluded. Allowing for general violation, right-right...
We confront the indications of lepton flavor universality (LFU) violation observed in semi-tauonic $B$ meson decays with new physics (NP) searches using high $p_T$ tau leptons at LHC. Using effective field theory arguments we correlate possible non-standard contributions to charged currents $\tau^+ \tau^-$ signature energy hadron colliders. Several representative standard model extensions put forward explain anomaly are examined detail: (i) weak triplet color-neutral vector resonances, (ii)...
During 2011 the LHCb experiment at CERN collected 1.0 fb−1 of $\sqrt{s} = 7\mbox{~TeV}$ pp collisions. Due to large heavy quark production cross-sections, these data provide unprecedented samples flavoured hadrons. The first results from have made a significant impact on flavour physics landscape and definitively proved concept dedicated in forward region hadron collider. This document discusses implications measurements classes extensions Standard Model, bearing mind interplay with searches...
In the original version of this manuscript, an error was introduced on pp352. '2.7nb:1.6nb' has been corrected to '2.4nb:1.3nb' in current online and printed version. doi:10.1093/ptep/ptz106.
Run 2 LHC data show hints of a new resonance in the diphoton distribution at an invariant mass 750 GeV. We analyse terms boson, extracting information on its properties and exploring theoretical interpretations. Scenarios covered include narrow and, as preliminary indications suggest, wider resonance. If width persist, particle is likely to belong strongly-interacting sector. also how compatibility between 1 improved by postulating existence additional heavy particle, whose decays are...
In the standard model, scalar contributions to leptonic and semileptonic decays are helicity suppressed. The hypothesis of additional physical neutral/charged Higgses can enhance such give detectable effects especially in $B$ physics. For charged Higgs, experimental information on both $\mathrm{Br}(B\ensuremath{\rightarrow}D\ensuremath{\tau}\ensuremath{\nu})$ $\mathrm{Br}(B\ensuremath{\rightarrow}\ensuremath{\tau}\ensuremath{\nu})$ has already become available, particular,...
We investigate the direct and indirect bounds on dipole operators involving top quark. A careful analysis shows that experimental upper limit neutron electric moment strongly constrains chromo-electric of top. improve previous by 2 orders magnitude. This has significant implications for new physics models it also means $CP$ violation in pair production mediated will not be accessible at LHC. The conserving chromo-magnetic moments are constrained recent measurements $t\overline{t}$ spectrum...
The experimental results on the t bar production cross section at Tevatron are well described by QCD contributions within standard model, while recent measurement of forward-backward asymmetry cannot be accounted for this framework. We consider light colored scalars appearing in a particular SU(5) GUT model 45-dimensional Higgs representation. A virtue is that it connects presence SU(2) singlet (Delta_6) and color octet weak doublet (Delta_1) with bounds proton lifetime, which constrain...
Based on the established task of identifying boosted, hadronically decaying top quarks, we compare a wide range modern machine learning approaches. Unlike most methods they rely low-level input, for instance calorimeter output. While their network architectures are vastly different, performance is comparatively similar. In general, find that these new approaches extremely powerful and great fun.
We show that new physics models without flavor violating interactions can explain the recent anomalies in $b\ensuremath{\rightarrow}s{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ transitions. The arises from a ${Z}^{\ensuremath{'}}$ penguin which automatically predicts $V\ensuremath{-}A$ structure for quark currents effective operators. This framework either be realized renormalizable $U(1{)}^{\ensuremath{'}}$ setup or due to strongly interacting dynamics. dimuon resonance...
We apply techniques from Bayesian generative statistical modeling to uncover hidden features in jet substructure observables that discriminate between different a priori unknown underlying short distance physical processes multijet events. In particular, we use mixed membership model known as latent Dirichlet allocation build data-driven unsupervised top-quark tagger and $t\overline{t}$ event classifier. compare our proposal existing traditional machine learning approaches top-jet tagging....
This note proposes common standards and prescriptions for the effective-field-theory interpretation of top-quark measurements at LHC.
A bstract We describe a technique to learn the underlying structure of collider events directly from data, without having particular theoretical model in mind. It allows infer aspects that may have given rise this structure, and can be used cluster or classify for analysis purposes. The unsupervised machine-learning is based on probabilistic (Bayesian) generative Latent Dirichlet Allocation. pair with an approximate inference algorithm called Variational Inference, which we then use extract...
Unsupervised anomaly-detection could be crucial in future analyses searching for rare phenomena large datasets, as example collected at the LHC. To this end, we introduce a physics inspired variational autoencoder (VAE) architecture which performs competitively and robustly on LHC Olympics Machine Learning Challenge datasets. We demonstrate how embedding some physical observables directly into VAE latent space, while same time keeping manifestly agnostic to them, can help identify...
The recent Belle II observation of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>B</a:mi><a:mo stretchy="false">→</a:mo><a:mi>K</a:mi><a:msub><a:mi>E</a:mi><a:mrow><a:mi>miss</a:mi></a:mrow></a:msub></a:math> challenges theoretical interpretations in terms Standard Model neutrino final states. Instead, we consider new physics scenarios where up to two light-invisible particles spin 0 <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"...
We analyse the constraints on dimension-six ΔF=1 effective operators in models respecting MFV hypothesis, both one-Higgs doublet case and two-Higgs scenario with large tanβ. The are derived mainly from b→s inclusive observables measured at B factories. implications of these bounds view improved measurements exclusive b→sℓ+ℓ− s→dνν¯ transitions discussed.
The most general basis of operators parametrizing a low-scale departure from the SM particle content is constructed. gauge invariance enforced, and lowest dimensions are retained separately for new light neutral spin 0, 1/2, 1, 3/2. further decomposed into couplings to Higgs/gauge fields, pairs quark/lepton baryon/lepton number violating combinations fermion fields. This then used systematically investigate discovery potential rare FCNC decays K B mesons with missing energy in final state....
We show that the discovery channel for dark matter (DM) production at colliders can be through flavor violating interactions resulting in a novel signature of single top and large missing transverse energy. discuss several examples where DM is dominated by couplings: minimal models with bottom Yukawa, horizontal symmetries, nontrivial group representations. Discovery 7 TeV LHC few ${\mathrm{fb}}^{\ensuremath{-}1}$ may already possible.
Motivated by the tantalizing excesses recently reported in di-photon invariant mass spectrum at LHC, we scrutinize some implications of scalar resonances high energy proton-proton collisions. In particular, indications a large width impose several challenges for model building. We show how calculability and unitarity considerations severely limit possible perturbative realizations such signal propose simple criterion that can be adapted to any renormalizable model. Furthermore, discuss...