A5088146112- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Distributed and Parallel Computing Systems
- Computational Physics and Python Applications
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Library Science and Information Systems
- Digital Humanities and Scholarship
- Library Collection Development and Digital Resources
- Scientific Computing and Data Management
- Algorithms and Data Compression
- Health Sciences Research and Education
- Aquaculture disease management and microbiota
- Information Retrieval and Search Behavior
- Organizational Strategy and Culture
- Software Engineering Techniques and Practices
- Real-time simulation and control systems
- Particle Accelerators and Free-Electron Lasers
- Medical Research and Practices
- Spreadsheets and End-User Computing
European Organization for Nuclear Research
2023-2024
University of Bern
2020-2023
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2019-2021
Institut de Physique
2021
Centre National de la Recherche Scientifique
2019-2020
Excellence Cluster Universe
2015-2018
Technical University of Munich
2015
Johannes Gutenberg University Mainz
1996
Yale University
1969
We interpret the recent hints for lepton flavor universality violation in rare $B$ meson decays. Based on a model-independent effective Hamiltonian approach, we determine regions of new physics parameter space that give good description experimental data $R_K$ and $R_{K^*}$, which is tension with Standard Model predictions. suggest further measurements can help narrowing down viable explanations. stress measured values $R_{K^*}$ are fully compatible explanations other anomalies decays based...
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...
The anomalies in rare
A bstract Rare b hadron decays are considered excellent probes of new semileptonic four-fermion interactions microscopic origin. However, the same also correct high-mass Drell-Yan tails. In this work, we revisit first statement in context complementarity and chart space short-distance physics that could show up rare decays. We analyze latest → qℓ + ℓ − measurements, where q = d or s e μ , including most recent LHCb $$ {R}_{K^{\left(\ast \right)}} <mml:math...
We investigate whether the 2.6σ deviation from lepton flavour universality in B+→K+ℓ+ℓ− decays recently observed at LHCb experiment can be explained minimal composite Higgs models. show that a visible departure is indeed possible if left-handed muons have sizable degree of compositeness. Constraints Z-pole observables are avoided by custodial protection muon coupling.
Motivated by recent results the ATLAS and CMS collaborations on angular distribution of $$B \rightarrow K^* \mu ^+\mu ^-$$ decay, we perform a state-of-the-art analysis rare B meson decays based $$b s $$ transition. Using standard estimates hadronic uncertainties, confirm presence sizeable discrepancy between data SM predictions. We do not find evidence for $$q^2$$ or helicity dependence discrepancy. The can be consistently described new physics in form four-fermion contact interaction...
We present a global likelihood function in the space of dimension-six Wilson coefficients Standard Model Effective Field Theory (SMEFT). The includes contributions from flavour-changing neutral current B decays, lepton flavour universality tests charged- and neutral-current K meson-antimeson mixing observables K, B, D systems, direct CP violation -> {\pi}{\pi}, charged violating tau, muon electroweak precision on Z W poles, anomalous magnetic moments electron, muon, several other...
Partial compositeness is a key ingredient of models where the electroweak symmetry broken by composite Higgs state. Recently, UV completion partial was proposed, featuring new, strongly coupled gauge interaction as well new fundamental fermions and scalars. We work out full flavor structure minimal realization this idea investigate in detail consequences for physics. While $CP$ violation kaon mixing represents significant constraint on model, we find many viable parameter points passing all...
We present a model for third-family quark-lepton unification at the TeV scale featuring composite Higgs sector. The is based on variant of Pati-Salam model, so-called 4321 consisting gauge group SU(4)×SU(3)′×SU(2)L×U(1)X. spontaneous symmetry breaking to SM triggered dynamically by QCD-like confining same strong dynamics also produces as pseudo Nambu-Goldstone boson, connecting energy scales both sectors. predicts massive U1 vector leptoquark coupled dominantly third generation, recently put...
The Standard Model (SM) is augmented with a U(1)B−3Lμ gauge symmetry spontaneously broken above the TeV scale when an SM-singlet scalar condenses. Scalar leptoquarks S1(3)=(3‾,1(3),13) charged under mediate intriguing effects observed in muon (g−2), RK(⁎), and b→sμ+μ− angular distributions, while generically evading all other phenomenological constraints. fermionic sector minimally extended three right-handed neutrinos, successful type-I seesaw mechanism realized. Charged lepton flavor...
A bstract We develop an economical theoretical framework for combined explanations of the flavor physics anomalies involving muons: ( g − 2) μ , $$ {R}_{K^{\left(\ast \right)}} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:msup> <mml:mi>K</mml:mi> <mml:mfenced> <mml:mo>∗</mml:mo> </mml:mfenced> </mml:msup> </mml:msub> </mml:math> and b → sμ + angular distributions branching ratios, that was first initiated by some us in ref. [1]. The Standard...
Abstract Kaon physics is at a turning point – while the rare-kaon experiments NA62 and KOTO are in full swing, end of their lifetime approaching future experimental landscape needs to be defined. With HIKE, KOTO-II LHCb-Phase-II on table under scrutiny, it very good moment time take stock contemplate about opportunities these theoretical developments provide for particle coming decade beyond. This paper provides compact summary talks discussions from Kaons@CERN 2023 workshop, held September CERN.
We present a comprehensive numerical analysis of four-dimensional model with the Higgs as composite pseudo-Nambu-Goldstone boson that features calculable potential and protective custodial flavour symmetries to reduce electroweak fine-tuning. employ novel technique allows us for first time study constraints from radiative symmetry breaking, physics, precision tests, direct LHC bounds on fermion vector resonances in single framework. consider four different sector, one which we show not be...
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...
A bstract We investigate an economical explanation for the ( g − 2) μ anomaly with a neutral vector boson from spontaneously broken U(1) X gauge symmetry. The Standard Model fermion content is minimally extended by 3 right-handed neutrinos. Using battery of complementary constraints, we perform thorough investigation renormalizable, quark flavor-universal, vector-like models, allowing arbitrary kinetic mixing. Out 419 models integer charges not greater than ten, only 7 are viable solutions,...
A bstract Exclusive semileptonic b hadron decays ( → uℓν ) serve as a sandbox for probing strong and electroweak interactions extracting the CKM element V ub . Instead, this work investigates their underexplored potential to reveal new short-distance physics. Utilizing SMEFT conduit chart territory beyond SM, we demonstrate that substantive physics contributions in are necessarily linked correlated effects rare neutral-current decays, neutral B meson mixing or high-mass Drell-Yan tails. We...
We conduct a detailed numerical analysis of the composite pseudo-Nambu-Goldstone Higgs model based on next-to-minimal coset SO(6)/SO(5) ≅ SU(4)/Sp(4), featuring an additional SM singlet scalar in spectrum, which we allow to mix with boson. identify regions parameter space compatible all current exper-imental constraints, including radiative electroweak symmetry breaking, flavour physics, and direct searches at colliders. find scalar, mass predicted be below TeV, virtually unconstrained by...
A bstract We present a model of composite Dark Matter (DM), in which new QCD-like confining “hypercolor” sector generates naturally stable hyperbaryons as DM candidates and at the same time provides mass to weakly coupled gauge bosons H that serve mediators, coupling Standard Model (SM) fermions. By an appropriate choice symmetry horizontal SU(2) h SM flavor symmetry, we show how can be identified with recently put forward explanation for discrepancies rare B -meson decays. find scale...
I present the Python package smelli that implements a global likelihood function in space of dimension-six Wilson coefficients Standard Model Effective Field Theory (SMEFT). The includes contributions from large number flavor and other precision observables, currently 399 total.
Kaon physics is at a turning point -- while the rare-kaon experiments NA62 and KOTO are in full swing, end of their lifetime approaching future experimental landscape needs to be defined. With HIKE, KOTO-II LHCb-Phase-II on table under scrutiny, it very good moment time take stock contemplate about opportunities these theoretical developments provide for particle coming decade beyond. This paper provides compact summary talks discussions from Kaons@CERN 2023 workshop.