A5071317702- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Gaussian Processes and Bayesian Inference
- Black Holes and Theoretical Physics
- Topic Modeling
- Cosmology and Gravitation Theories
- Scientific Computing and Data Management
- Big Data Technologies and Applications
- Generative Adversarial Networks and Image Synthesis
- International Science and Diplomacy
- Anomaly Detection Techniques and Applications
- Quantum Mechanics and Applications
- Advanced Materials Characterization Techniques
- Astrophysics and Cosmic Phenomena
- Bayesian Methods and Mixture Models
- Distributed and Parallel Computing Systems
University of Cincinnati
2022-2024
University of Ljubljana
2022-2024
Jožef Stefan Institute
2016-2023
University of Zurich
2020-2023
Rutgers, The State University of New Jersey
2022-2023
European Organization for Nuclear Research
2023
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2022
Centre National de la Recherche Scientifique
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2022
Institut National de Physique Nucléaire et de Physique des Particules
2022
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)...
We examine various scenarios in which the Standard Model is extended by a light leptoquark state to solve for one or both $B$-physics anomalies, viz. $R_{D^{(\ast)}}^\mathrm{exp}> R_{D^{(\ast)}}^\mathrm{SM}$ or/and $R_{K^{(\ast)}}^\mathrm{exp}< R_{K^{(\ast)}}^\mathrm{SM}$. To do so we combine constraints arising from low-energy observables and direct searches at LHC. find that none of scalar leptoquarks mass $m_\mathrm{LQ} \simeq 1$ TeV can alone accommodate above mentioned anomalies. The...
We address the $B$-physics anomalies within a two scalar leptoquark model. The low-energy flavor structure of our set-up originates from $SU(5)$ operators that relate Yukawa couplings leptoquarks. proposed scenario has UV completion, can accommodate all measured lepton universality ratios in $B$-meson decays, is consistent with related observables, and compatible direct searches at LHC. provide prospects for future discoveries light leptoquarks LHC predict several yet-to-be-measured observables.
We revisit the possibilities of accommodating experimental indications lepton flavor universality violation in $b$-hadron decays minimal scenarios which Standard Model is extended by presence a single $\mathcal{O}(1\,\mathrm{TeV})$ leptoquark state. To do so we combine most recent low energy physics constraints, including $R_{K^{(\ast)}}^\mathrm{exp}$ and $R_{D^{(\ast)}}^\mathrm{exp}$, them with bounds on masses their couplings to quarks leptons as inferred from direct searches at LHC...
Motivated by the recent LHCb announcement of a $3.1\sigma$ violation lepton-flavor universality in ratio $R_K=\Gamma(B\to K\mu^+\mu^-)/\Gamma(B\to K e^+ e^-)$, we present an updated, comprehensive analysis flavor anomalies seen both neutral-current ($b\to s\ell^+\ell^-$) and charged-current c\tau\bar\nu$) decays $B$ mesons. Our study starts from model-independent effective field-theory approach then considers simplified model UV-complete extension Standard Model featuring vector leptoquark...
We investigate the high-$p_T$ tails of $pp\to \ell \nu$ and $pp \to \ell$ Drell-Yan processes as probes New Physics in semileptonic interactions with an arbitrary flavor structure. For this purpose, we provide a general decomposition $2\to2$ scattering amplitudes terms form-factors that match to specific scenarios, such Standard Model Effective Field Theory (SMEFT), including all relevant operators up dimension-$8$, well ultraviolet scenarios giving rise tree-level exchange new bosonic...
Motivated by the success of flavour physics programme carried out over last decade at Large Hadron Collider (LHC), we characterize in detail potential its High-Luminosity and High-Energy upgrades this domain physics. We document extraordinary breadth HL/HE-LHC enabled a putative Upgrade II dedicated experiment LHCb evolution established role ATLAS CMS general purpose experiments. connect to studies top quark, Higgs boson, direct high-$p_T$ searches for new particles force carriers. discuss...
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 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....
We investigate the ability of $S_3$ scalar leptoquark to address recent hints lepton universality violation in $B$ meson decays. The with quantum numbers $(\overline{\mathbf{3}},\mathbf{3},1/3)$ naturally emerges context an $SU(5)$ GUT model without any conflict stringent limits from observed nucleon stability. Scalar left-handed couplings 2nd and 3rd generations charged leptons down-type quarks seems well-suited both $R_{K^{(*)}}$ $R_{D^{(*)}}$. quantify this suitability numerical fits a...
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...
HighPT is a Mathematica package for the analysis of high-energy data semileptonic transitions at hadron colliders. It allows to compute high-$p_T$ tail observables processes, i.e. Drell-Yan cross sections, dilepton and monolepton final states LHC. These can be calculated tree level within Standard Model Effective Field Theory, including relevant operators up dimension eight ensure consistent description section terms $\mathcal{O}(\Lambda^{-4})$ in cutoff scale $\Lambda$. For New Physics...
We analyze the possibility to accommodate current b→sℓ+ℓ− anomalies with TeV-scale mediators that couple right-handed top quarks and muons, contributing at one-loop level. use Standard Model Effective Field Theory (SMEFT) framework but also look specific scenarios by taking into account all possible irreducible representations of Lorentz gauge group for mediators. From a global fit data LEP-I observables we find Wilson coefficients two SMEFT operators: Oℓu=(ℓ¯LμγαℓLμ)(t¯RγαtR)...
Starting from a general effective Lagrangian for lepton flavor violation (LFV) in quark-lepton transitions, we derive constraints on the coefficients high-mass tails of dilepton processes pp→ℓkℓl (with k≠l ). The current (projected) limits derived this paper LHC data with 36fb-1 ( 3ab-1 ) can be applied to generic new physics scenarios, including ones scalar, vector and tensor operators. For purely left-handed operators, explicitly compare these flavor-physics observables, illustrating...
A bstract We analyse how U(3) 5 and U(2) flavour symmetries act on the Standard Model Effective Field Theory, providing an organising principle to classify large number of dimension-six operators involving fermion fields. detailed counting such operators, at different order in breaking terms both these symmetries, is presented. brief discussion about possible deviations from two reference cases, a simple example usefulness this classification scheme for high- p T analyses LHC, are also
We design a search strategy for the Standard Model $t\bar t \bar t$ production at LHC in same-sign dilepton and trilepton channels. study different signal features and, given small expected number of events, we scrutinize detail all reducible irreducible backgrounds. Our analysis shows that by imposing set basic jet lepton selection criteria, SM $pp \to t\bar process could be evidenced near future, within Run-II, when combining both multi-lepton argue this should also used as guideline to...
Jets at the LHC, typically consisting of a large number highly correlated particles, are fascinating laboratory for deep generative modeling. In this paper, we present two novel methods that generate LHC jets as point clouds efficiently and accurately. We introduce \epcjedi, which combines score-matching diffusion models with Equivariant Point Cloud (EPiC) architecture based on sets framework. This model offers much faster alternative to previous transformer-based without reducing quality...
A bstract We analyze the prospects of probing C P -odd $$ i\tilde{\kappa}\overline{t}\gamma <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>i</mml:mi> <mml:mover> <mml:mi>κ</mml:mi> <mml:mo>˜</mml:mo> </mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> <mml:mi>γ</mml:mi> </mml:math> 5 th interaction at LHC and its projected upgrades, high-luminosity high-energy LHC, directly using associated on-shell Higgs boson top quark or pair production. To this end we first construct a...
We discuss a model that can accommodate the $B$-physics anomalies, based on combining two scalar leptoquarks, ${R}_{2}$ and ${S}_{3}$, of mass $\mathcal{O}(1\text{ }\text{ }\mathrm{TeV})$, we proposed in our previous paper. update analysis its parameter space show remains viable consistent with number low energy high flavor physics constraints. Since predicts nonzero new phase, possibility to test contribution neutron electric dipole moment angular distributions exclusive...
Abstract In this letter, we use LHC data from the Drell–Yan processes $$pp\rightarrow \ell _i\ell _j$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>p</mml:mi> <mml:mo>→</mml:mo> <mml:msub> <mml:mi>ℓ</mml:mi> <mml:mi>i</mml:mi> </mml:msub> <mml:mi>j</mml:mi> </mml:mrow> </mml:math> (with $$i\ne j$$ <mml:mo>≠</mml:mo> ) to derive model-independent upper limits on lepton-flavor-violating meson decays. Our analysis is based an Effective Field Theory (EFT) approach...
We propose an extension of the existing experimental strategy for measuring branching fractions top quark decays, targeting specifically t\to j_q W <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>t</mml:mi><mml:mo>→</mml:mo><mml:msub><mml:mi>j</mml:mi><mml:mi>q</mml:mi></mml:msub><mml:mi>W</mml:mi></mml:mrow></mml:math> , where display="inline"><mml:msub><mml:mi>j</mml:mi><mml:mi>q</mml:mi></mml:msub></mml:math> is a light jet. The improved uses...
Individual events at high-energy colliders like the LHC can be represented by a sequence of measurements, or 'point patterns'. Starting from this generic data representation, we build simple Bayesian probabilistic model for event measurements useful unsupervised classification in beyond standard (BSM) studies. In order to arrive assume that are exchangeable (and apply De Finetti's representation theorem), is discrete, and generated multiple 'latent' distributions (called themes). The...