A5040464441- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Physics of Superconductivity and Magnetism
- Benford’s Law and Fraud Detection
- Mathematical Approximation and Integration
- Advanced Topics in Algebra
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Matrix Theory and Algorithms
- Nuclear reactor physics and engineering
- Magnetism in coordination complexes
- Fuzzy and Soft Set Theory
- Inorganic Fluorides and Related Compounds
- Simulation Techniques and Applications
- Scientific Computing and Data Management
- Scientific Research and Discoveries
- Superconducting Materials and Applications
Université Savoie Mont Blanc
2015-2024
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2014-2024
Centre National de la Recherche Scientifique
2014-2023
SIL International
2022
European Organization for Nuclear Research
2009-2021
Laboratoire d’Annecy de Physique des Particules
2019
Institut National de Physique Nucléaire et de Physique des Particules
2019
Sapienza University of Rome
2003-2016
Université Paris-Saclay
2011
Laboratoire de Physique Théorique
2011
The LHCb Collaboration's measurement of R_K = B(B+ -> K+ mu+ mu-)/B(B+ e+e-) lies 2.6 sigma below the Standard Model prediction. Several groups suggest this deficit to result from new lepton non-universal interactions muons. But leptonic imply flavor violation in B decays at rates much larger than are expected Model. A simple model shows that these could lie just current limits. An interesting consequence our model, B(B_s mu-)_{exp}/B(B_s mu-)_{SM} 0.75, is compatible with recent...
Following the updated measurement of lepton flavour universality (LFU) ratio R_K in B -> Kll decays by LHCb, as well a number further measurements, e.g. R_K* Belle and B_s mu ATLAS, we analyse global status new physics b s transitions weak effective theory at b-quark scale, Standard Model electroweak simplified models physics. We find that data continues to strongly prefer solution with semi-leptonic Wilson coefficients. A purely muonic contribution combination C_9 = -C_10, suited...
We point out that the observed $CP$ violation in ${B}_{d}\ensuremath{-}{\overline{B}}_{d}$ mixing, taking into account measured ratio $\ensuremath{\Delta}{M}_{d}/\ensuremath{\Delta}{M}_{s}$, recently decreased lattice value of nonperturbative parameter ${\stackrel{^}{B}}_{K}$ and an additional effective suppression factor ${\ensuremath{\kappa}}_{ϵ}\ensuremath{\simeq}0.92$ ${ϵ}_{K}$ neglected so far most analyses, may be insufficient to describe within standard model (SM), thus hinting at new...
We analyse the structure of long distance (LD) contributions to CP-violating parameter epsilon_K, that generally affect both absorptive (Gamma_12) and dispersive (M_12) parts K0 -- K0bar mixing amplitude. point out that, in a consistent framework, addition LD Im(Gamma_12), estimated recently by two us, also Im(M_12) have be taken into account. Estimating latter impact effects on epsilon_K is significantly reduced (from -6.0 % -3.6 %). The overall effect corrections superweak phase being...
We consider the $B^0_s \to \mu^{+} \mu^{-} \gamma$ effective lifetime, and related CP-phase sensitive quantity $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$, as a way to obtain qualitatively new insights on current $B$-decay discrepancies. Through fit comparing pre- post-Moriond-2021 data we identify few theory benchmark scenarios addressing these discrepancies, featuring large CP violation in addition. then explore possibility of telling apart with once resonance-modeling form-factor uncertainties...
Experimental data have provided intriguing hints for the violation of lepton flavour universality (LFU), including $B\to D^{(*)}\tau\nu/B\to D^{(*)}\ell\nu$, anomalous magnetic moment muon and $b\!\to\! s\ell^+\ell^-$ with a significance $\!>3\,\sigma$, $>\!4\,\sigma$ $>\!5\,\sigma$, respectively. Furthermore, in recent re-analysis 2018 Belle data, it was found that forward-backward asymmetry ($\Delta A_{\rm FB}$) $B \to D^{*}\mu\bar \nu$ vs D^{*}e\bar disagrees SM prediction by...
The duration of the neutrino burst from supernova event SN 1987A is known to be sensitive exotic sources cooling, such as axions radiated dense and hot hadronic matter thought constitute inner core supernova. We perform first quantitative study role beyond generation—–in particular strange matter. do so by consistently including full baryon meson octets, computing axion emissivity induced baryon-meson baryon-axion scatterings well decays. consider a range thermodynamic conditions,...
We construct an anomaly-free extension of the left-right symmetric model, where maximal flavor group is gauged and anomaly cancellation guaranteed by adding new vectorlike fermion states. address question lowest allowed symmetry scale consistent with data. Because mechanism recently pointed out Grinstein et al. tree-level changing neutral currents turn to play a very weak constraining role. The same occurs, in our for electroweak precision observables. main constraint turns come from...
We apply twisted boundary conditions to lattice QCD simulations of three-point correlation functions in order access spatial components hadronic momenta different from the integer multiples $2\ensuremath{\pi}/L$. calculate vector and scalar form factors relevant $K\ensuremath{\rightarrow}\ensuremath{\pi}$ semileptonic decay consider all possible ways twisting one quark lines functions. show that momentum shift produced by does not introduce any additional noise easily allows us determine...
A bstract The evidence of Dark Matter (DM) is one the strongest observational arguments in favor physics beyond Standard Model. Despite expectations, a similar has been lacking so far collider searches, with possible exception B -physics discrepancies, coherent set persistent deviations homogeneous dataset consisting b → c and s semi-leptonic transitions. We explore question whether DM discrepancies may have common origin. do context so-called 4321 gauge model, UV-complete calculable setup...
$B_s \to \mu^+ \mu^- \gamma$, measured at high $q^2$ as a partially reconstructed decay, can probe the origin of existing discrepancies in semi-leptonic $b s$ and c$ decays. We perform complete study this possibility. start by reassessing alleged discrepancies, with focus on unified EFT description. Using SMEFT, we find that tauonic Wilson coefficient required $R(D^{(*)})$ implies universal muonic precisely size semi-muonic BR data and, separately, angular analyses. thus identify reference...
We reappraise the question of whether standard model, and minimal flavor violating (MFV) models at large, can simultaneously describe observed $CP$ violation in $K$ ${B}_{d}$ systems. find that system, measured most precisely through $(\mathrm{sin}2\ensuremath{\beta}{)}_{J/\ensuremath{\psi}{K}_{s}}$, implies $|{ϵ}_{K}^{\mathrm{SM}}|=1.78(25)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ for parameter ${ϵ}_{K}$, measuring indirect to be compared with experimental value...
We discuss a number of strategies to reduce the $\mathcal B(B^0_s \to \ell^{+} \ell^{-} \gamma)$ theoretical error, and make such measurement new probe interactions that are interesting in light present-day flavor discrepancies. In particular, for low di-lepton invariant mass we propose exploit close parenthood between measured \phi (\to K^+ K^-) \gamma)$. For high $q^2$, conversely, fact decay is dominated by two form-factor combinations, plus contributions from broad charmonium model...
We present a model for calculating charged-lepton mixing matrices. These matrices are an essential ingredient predicting lepton flavor-violating rates in the number nonuniversal models recently proposed to explain anomalies B-meson decays. The is based on work "constrained flavor breaking" by Appelquist, Bai and Piai relating mass matrix, M_l, those up down-type quarks, M_{u,d}. use our recent of nonuniversality illustrate magnitudes B-decay that might be expected. Decays with mu tau final...
A bstract One of the greatest challenges for models b → s anomalies is necessity to produce a large contribution quark times lepton current, J q × ℓ , and avoid accordingly contributions flavour-changing amplitudes, which are severely constrained by data. We consider gauged horizontal symmetry involving two heaviest generations all left-handed fermions. In limit degenerate masses bosons, in absence mixing between heavier lighter one, such would make amplitudes exactly flavour-diagonal....
We use a recent lattice determination of the vector and axial $D_s \to \gamma$ form factors at high squared momentum transfer $q^2$ to infer their $B_s counterparts. To this end, we introduce phenomenological approach summarized as follows. First, describe data with different fit templates motivated by vector-meson dominance, that is expected hold in high-$q^2$ region considered. identify reference ansaetze one or two physical poles, validate against alternative templates. Then, pole...