A5050909733- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Matrix Theory and Algorithms
- Stochastic processes and financial applications
- Model-Driven Software Engineering Techniques
- Geophysical and Geoelectrical Methods
- Business Process Modeling and Analysis
- Ionosphere and magnetosphere dynamics
- Quantum, superfluid, helium dynamics
- Radiation Therapy and Dosimetry
University of Zurich
2016-2025
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2007-2016
European Organization for Nuclear Research
2000-2014
Istituto Nazionale di Fisica Nucleare
1992-2011
Technical University of Munich
2000-2010
Institute for Advanced Study
2010
Universidad de Granada
2010
Los Alamos National Laboratory
2010
Scuola Normale Superiore
2008-2009
Johannes Gutenberg University Mainz
2008
A bstract We present the first complete next-to-next-to-leading order analysis of Standard Model Higgs potential. computed two-loop QCD and Yukawa corrections to relation between quartic coupling ( λ ) mass M h ), reducing theoretical uncertainty in determination critical value for vacuum stability 1 GeV. While at Planck scale is remarkably close zero, absolute potential excluded 98 % C.L. < 126 Possible consequences near vanishing scale, including speculations about role field during...
Motivated by additional experimental hints of Lepton Flavour Universality violation in B decays, both charged- and neutral-current processes, we analyse the ingredients necessary to provide a combined description these phenomena. By means an Effective Field Theory (EFT) approach, based on hypothesis New Physics coupled predominantly third generation left-handed quarks leptons, show how this is possible. We demonstrate, particular, solve problems posed electroweak precision tests direct...
The collection of a few anomalies in semileptonic B-decays invites to speculate about the emergence some strikingly new phenomena. Here we offer possible interpretation these context weakly broken $$U(2)^5$$ flavor symmetry and leptoquark mediators.
In view of recent experimental indications violations Lepton Flavor Universality (LFU) in B decays, we analyze constraints and implications LFU interactions, both using an effective theory approach, explicit dynamical model. We show that a simple model based on SU(2) L triplet massive vector bosons, coupled predominantly to third generation fermions (both quarks leptons), can significantly improve the description present data. particular, decreases tension between data SM predictions...
We present a three-site Pati–Salam gauge model able to explain the Standard Model flavor hierarchies while, at same time, accommodating recent experimental hints of lepton-flavor non-universality in B decays. The is consistent with low- and high-energy bounds, predicts rich spectrum new states TeV scale that could be probed near future by high-pT experiments LHC.
We evaluate the impact of radiative corrections in ratios $$\Gamma [B\rightarrow M \mu ^+\mu ^-]/\Gamma \mathrm{e}^+\mathrm{e}^-]$$ when meson is a K or $$K^*$$ . Employing cuts on $$m^2_{\ell \ell }$$ and reconstructed B-meson mass presently applied by LHCb Collaboration, such do not exceed few $$\%$$ Moreover, their effect well described (and corrected for) existing Monte Carlo codes. Our analysis reinforces interest these observables as clean probe physics beyond Standard Model.
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
In the last decade, huge progress in experimentally measuring and theoretically understanding flavor physics has been achieved. particular, accuracy determination of CKM elements greatly improved, a large number changing neutral current processes, involving b -> d, s c u transitions, CP violating asymmetries, have measured. No evidence for new established. Consequently, strong constraints on at high scale apply. structure TeV is strongly constrained. We review these we discuss which are...
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...
A bstract We present a thorough investigation of the vector leptoquark hypothesis for combined explanation B -physics anomalies. analyze this from twofold perspective, taking into account recent results observables and high- p T searches. First, using simplified model, we determine general conditions successful low-energy fit in presence right-handed couplings (neglected previous analyses). Second, show how these conditions, particular sizable 2-3 family mixing, can be achieved motivated...
A bstract The three-site Pati-Salam gauge model provides a consistent description for the hints of lepton-flavor non-universality observed in B decays, connecting present pattern “anomalies” to origin Standard Model Yukawa couplings. We here detailed analysis predictions series low-energy observables, mainly and τ physics. is good agreement with data predicts well-defined non-standard effects observables that could allow us test it near future. Particularly interesting are large → μ Lepton...
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...
The standard model is successful at describing most of the data electroweak scale, but there are indications that new physics should exist a higher energy scale. To identify, quantify, and elucidate physics, one can use framework effective field theory. This article reviews construction theoretical tools provided by theory for analyzing present future experimental data, as well ideas physics.
A bstract We present a comprehensive analysis of electroweak, flavor, and collider bounds on the complete set dimension-six SMEFT operators in U(2) 5 -symmetric limit. This operator basis provides consistent framework to describe wide class new physics models and, particular, motivated where degrees freedom couple mostly third generation. By analyzing observables from all three sectors, consistently including renormalization group evolution, we provide effective scale 124 -invariant...
Motivated by the first evidence of Bu→τν transition reported Belle [Belle Collaboration, K. Ikado, et al., hep-ex/0604018] and precise ΔMBs measurement CDF [CDF G. Gomez-Ceballos, Talk presented at FPCP 2006, Vancouver, Canada, 9–12 April http://fpcp2006.triumf.ca/; D∅ V. Abazov, hep-ex/0603029], we analyse these other low-energy observables in framework MSSM large tanβ. We show that for heavy squarks A terms (Mq˜, AU≳1 TeV) such scenario has several interesting virtues. It naturally...
The ATLAS and CMS experiments at the LHC have reported observation of a possible excess events corresponding to new particle h with mass ∼125 GeV that might be long-sought Higgs boson, or something else. Decyphering nature this signal will require constraining couplings measuring them as accurately possible. Here we analyze indirect constraints on flavour-changing decays are provided by limits low-energy interactions. We find in quark sector impose such strong quark–antiquark pairs unlikely...
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...