A5091042007- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Distributed and Parallel Computing Systems
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Stochastic processes and financial applications
- Nuclear physics research studies
- Scientific Computing and Data Management
- Advanced Algebra and Geometry
- Mathematical Dynamics and Fractals
- Environmental Sustainability and Technology
- Advanced NMR Techniques and Applications
- Mathematical functions and polynomials
- IgG4-Related and Inflammatory Diseases
- Computational Geometry and Mesh Generation
- Algebraic Geometry and Number Theory
Universitat de Barcelona
2016-2024
Institut Català de Ciències del Clima
2023-2024
Technical University of Munich
2017-2021
Massachusetts Institute of Technology
2017-2020
University of Bern
2016-2018
Laboratoire de Physique Théorique
2013-2017
Universitat Autònoma de Barcelona
2005-2017
Centre National de la Recherche Scientifique
2016-2017
Université Paris-Saclay
2016-2017
Université Paris-Sud
2016-2017
We present a global analysis of the $B\ensuremath{\rightarrow}{K}^{*}(\ensuremath{\rightarrow}K\ensuremath{\pi}){\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decay using recent LHCb measurements primary observables ${P}_{1,2}$ and ${P}_{4,5,6,8}^{\ensuremath{'}}$. Some them exhibit large deviations with respect to Standard Model (SM) predictions. explain observed pattern through new physics contribution Wilson coefficient semileptonic operator ${\mathcal{O}}_{9}$. This has an...
Weak radiative decays of the B mesons belong to most important flavor changing processes that provide constraints on physics at TeV scale. In derivation such constraints, accurate standard model predictions for inclusive branching ratios play a crucial role. current Letter we present an update these predictions, incorporating all our results O(α_{s}^{2}) and lower-order perturbative corrections have been calculated after 2006. New estimates nonperturbative effects are taken into account,...
In the Standard Model (SM), rare transitions where a bottom quark decays into strange and pair of light leptons exhibit potential sensitivity to physics beyond SM. addition, SM embeds Lepton Flavour Universality (LFU), leading almost identical probabilities for muon electron modes. The LHCb collaboration discovered set deviations from expectations in muons also ratios assessing LFU. Other experiments (Belle, ATLAS, CMS) found consistent measurements, albeit with large error bars. We perform...
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...
We present a detailed discussion of the current theoretical and experimental situation anomaly in angular distribution B → K * (→ Kπ)μ + μ −, observed at LHCb 1 fb−1 dataset recently confirmed by 3 dataset. The impact this data other recent measurements on b sℓ ℓ − transitions (ℓ = e, μ) is considered. review observables interest, focusing their uncertainties sensitivity to New Physics, based an analysis employing QCD factorisation approach including several sources hadronic (form factors,...
We study the generic features of minimal gauge extensions Standard Model in view recent hints lepton-flavor non-universality semi-leptonic $b \to s \ell^+ \ell^-$ and c \ell \nu$ decays. classify possible models according to symmetry-breaking pattern source flavor non-universality. find that viable $\mathrm{SU(2)}_L$ factor is embedded non-trivially extended group, couplings should be universal, hinting presence new degrees freedom sourcing Finally, we provide an explicit model can explain...
A bstract We discuss the observables for B → K * (→ Kπ ) ℓ + − decay, focusing on both CP-averaged and CP-violating at large low hadronic recoil with special emphasis their sensitivity to form-factor uncertainties. identify an optimal basis of that balances theoretical experimental advantages, which will guide New Physics searches in short term. some advantages basis, particular improved compared other observables. present predictions within Standard Model interest, integrated over...
We investigate a gauge extension of the Standard Model in light observed hints lepton universality violation b → cℓν and sℓ + ℓ − decays at BaBar, Belle LHCb. The model consists an extended group SU(2)1 × SU(2)2 U(1) Y which breaks spontaneously around TeV scale to electroweak group. Fermion mixing effects with vector-like fermions give rise potentially large new physics contributions flavour transitions mediated by W′ Z′ bosons. This can ease tensions B-physics data while satisfying...
We present DsixTools, a Mathematica package for the handling of dimension-six Standard Model Effective Field Theory. Among other features, DsixTools allows user to perform full one-loop Renormalization Group Evolution Wilson coefficients in Warsaw basis. This is achieved thanks SMEFTrunner module, which implements anomalous dimension matrix previously derived literature. In addition, also contains modules devoted matching $\Delta B = \Delta S 1,2$ and C 1$ operators Weak Theory at...
We perform a model-independent global fit to $$b\rightarrow s\ell ^+\ell ^-$$ observables confirm existing New Physics (NP) patterns (or scenarios) and identify new ones emerging from the inclusion of updated LHCb Belle measurements $$R_K$$ $$R_{K^*}$$, respectively. Our analysis, updating Refs. Capdevila et al. (J Virto JHEP 1801:093, 2018) Algueró Matias Phys Rev D 99(7):075017, 2019) including these data, suggests presence right-handed couplings encoded in Wilson coefficients...
A bstract We revisit the theoretical predictions and parametrization of non-local matrix elements in rare $$ {\overline{B}}_{(s)}\to \left\{{\overline{K}}^{\left(\ast \right)},\phi \right\}{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mover> <mml:mi>B</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mfenced> <mml:mi>s</mml:mi> </mml:mfenced> </mml:msub> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>∗</mml:mo>...
A bstract We provide improved Standard Model theory predictions for the exclusive rare semimuonic processes B → K (*) μ + − and s ϕμ . Our results are based on a novel parametrization of non-local form factors, which manifestly respects recently developed dispersive bound. critically compare our to those obtained in framework QCD factorization. provide, first time, parametric estimates systematic uncertainties due contributions. Comparing within available experimental data, we find large...
This paper presents a comprehensive review of both the theory and experimental successes Quantum Chromodynamics, starting with its emergence as well defined in 1972-73 following developments results up to present day. Topics include earliest theoretical foundations; fundamental constants QCD; an introductory discussion lattice QCD, only known method for obtaining exact predictions from methods approximating special focus on effective field theories; QCD under extreme conditions; measurements...
We perform a frequentist analysis of q^2-dependent B-> K*(->Kpi)ll angular observables at large recoil, aiming bridging the gap between current theoretical analyses and actual experimental measurements. focus on most appropriate set to measure role q^2-binning. highlight importance P_i exhibiting limited sensitivity soft form factors for search New Physics contributions. compute predictions these binned in Standard Model, we compare them with their determination extracted from recent LHCb...
The recent LHCb angular analysis of the exclusive decay B → K * μ + − has indicated significant deviations from Standard Model expectations. Accurate predictions can be achieved at large *-meson recoil for an optimised set observables designed to have no sensitivity hadronic input in heavy-quark limit leading order α s . However, uncertainties reappear through non-perturbative ΛQCD /m b power corrections, which must assessed precisely. In framework QCD factorisation we present a systematic...
General analyses of B-physics processes beyond the Standard Model require accounting for operator mixing in renormalization-group evolution from matching scale down to typical B physics. For this purpose anomalous dimensions full set local dimension-six operators are needed. We present here first time a complete and non-redundant relevant B-meson decay, together with one-loop QCD QED. These results an important step towards automation general New Physics analyses.
We study the implications of recent measurements ${R}_{K}$ and ${R}_{{K}^{*}}$ by LHCb Collaboration. do that adopting a model-independent approach based on Standard Model effective field theory (SMEFT), with dominant new physics (NP) effects encoded in coefficients dimension-6 operators respecting full (SM) gauge symmetry. After providing simplified expressions for ${R}_{{K}^{*}}$, we determine results these observables SMEFT at low high energies. also take into account all...
The B → K ∗ μμ decay exhibits deviations with respect to Standard Model expectations and the measurement of ratio R hints at a violation lepton-flavour universality in Kℓℓ transitions. Both effects can be understood model-independent fits as short-distance contribution Wilson coefficient C 9μ , some room for similar contributions other coefficients b sμμ We discuss how full angular analysis ee its comparison could improve our understanding these anomalies help confirming their interpretation...
We extend the framework of QCD factorization to non-leptonic $B$ decays into three light mesons, taking as an example decay $B^+ \to \pi^+ \pi^-$. discuss properties this in different regions phase space. argue that, limit very large $b$-quark mass, central region Dalitz plot can be described terms $B \pi$ form factor and $\pi$ light-cone distribution amplitudes. The edges plot, on other hand, require non-perturbative input: \pi two-pion amplitude. present set-up for both leading order...
$\tt DsixTools$ is a Mathematica package for the handling of Standard Model Effective Field Theory (SMEFT) and Low-energy (LEFT) with operators up to dimension six, both at algebraic numerical level. contains visually accessible operationally convenient repository all parameters SMEFT LEFT. This also provides information concerning symmetry categories number degrees freedom, routines that allow implement this on global expressions (such as decay amplitudes cross-sections). performs weak...
EOS is an open-source software for a variety of computational tasks in flavor physics. Its use cases include theory predictions within and beyond the Standard Model particle physics, Bayesian inference parameters from experimental theoretical likelihoods, simulation pseudo events number signal processes. ensures high-performance computations through C++ back-end ease usability Python front-end. To achieve this flexibility, enables user to select implementations relevant decay processes...
A bstract We propose a stronger formulation of the dispersive (or unitarity) bounds à la Boyd-Grinstein-Lebed (BGL), which are commonly applied in analyses hadronic form factors for B decays. In our approach, existing split into several new bounds, thereby disentangling that jointly bounded common approach. This leads to constraints these objects, significant simplification numerical analysis, and removal spurious correlations among factors. apply novel $$ \overline{B}\to...
We discuss a novel approach to systematically determine the dominant long-distance contribution $$B\rightarrow K^*\ell \ell $$ decays in kinematic region where dilepton invariant mass is below open charm threshold. This provides most consistent and reliable determination date can be used compute Standard Model predictions for all observables of interest, including lies between $$J/\psi $$\psi (2S)$$ resonances. illustrate power our results by performing New Physics fit Wilson coefficient...