A5080435129- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Noncommutative and Quantum Gravity Theories
- Quantum and Classical Electrodynamics
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Molecular spectroscopy and chirality
- Muon and positron interactions and applications
- Algebraic structures and combinatorial models
- Chemistry and Stereochemistry Studies
- High voltage insulation and dielectric phenomena
- Quantum and electron transport phenomena
- Scientific Computing and Data Management
- Life Cycle Costing Analysis
- Enzyme Structure and Function
- Geometry and complex manifolds
- Cold Fusion and Nuclear Reactions
Centre National de la Recherche Scientifique
2013-2024
Centre de Physique Théorique
2015-2024
Aix-Marseille Université
2013-2024
Budker Institute of Nuclear Physics
2020
Novosibirsk State University
2020
Centre d’Immunologie de Marseille-Luminy
2008-2019
Institut National de Physique Nucléaire et de Physique des Particules
1991-2017
Institut de Physique
1989-2016
Université Paris-Sud
2013-2016
Laboratoire de Physique Théorique
2013-2016
The correction to the muon anomalous magnetic moment from pion-pole contribution hadronic light-by-light scattering is considered using a description of ${\ensuremath{\pi}}^{0}\ensuremath{-}{\ensuremath{\gamma}}^{*}\ensuremath{-}{\ensuremath{\gamma}}^{*}$ transition form factor based on large-${N}_{C}$ and short-distance properties QCD. resulting two-loop integrals are treated by first performing angular integration analytically, method Gegenbauer polynomials, followed numerical evaluation...
The hadronic light-by-light contribution to a(mu), the anomalous magnetic moment of muon, is discussed from point view an effective low-energy theory. As application, coefficient leading logarithm arising two-loop graphs involving two vertices computed, and found be positive. This corresponds a positive sign for pion-pole correction sizable reduction discrepancy between present experimental value a(mu) its theoretical counterpart in standard model.
Using an effective \sigma/f_0(500) resonance, which describes the \pi\pi-->\pi\pi and \gamma\gamma-->\pi\pi scattering data, we evaluate its contribution ones of other scalar mesons to hadronic light-by-light (HLbL) component anomalous magnetic moment a_\mu muon. We obtain conservative range values: \sum_S~a_\mu^{lbl}\vert_S = -(4.51+- 4.12) 10^{-11}, is dominated by ( 50%~98%), where large error due uncertainties on parametrisation form factors. Considering our new result, update sum...
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.
Following a recent suggestion by Weinberg, we use the large-N expansion in QCD to discuss decay amplitudes of tetraquarks into ordinary mesons as well their mixing properties. We find that flavor structure tetraquark is crucial ingredient determine both this decays. Although some cases should be expected narrow mesons, they may get even narrower, depending on structure.
The counterterm combination that describes the decay of pseudoscalar mesons into charged lepton pairs at lowest order in chiral perturbation theory is considered within framework QCD limit a large number colors ${N}_{c}$. When further restricted to meson dominance approximation large- ${N}_{c}$ QCD, our results agree well with available experimental data.
Because of their small electromagnetic corrections, the isospin-breaking decays $\eta\to3\pi$ seem to be good candidates for extracting parameters $ (m_d-m_u)$. This task is unfortunately complicated by large chiral corrections and discrepancy between experimentally measured values Dalitz describing energy dependence amplitudes these those predicted from perturbation theory. We present two methods based on an analytic dispersive representation that use information NNLO result one measurement...
A bstract We continue our study of strongly-coupled, approximately scale-invariant gauge theories with a large number flavours, which provide suitable ultraviolet completion the composite-Higgs scenario. identify requisite operators to realise partial compositeness Standard-Model fermions. In order compute spectrum composite fermionic states, we extend bottom-up holographic models, previously introduced capture main features non-perturbative dynamics in Veneziano limit, by adding fermion...
We consider a vectorlike gauge theory of fermions that confines at the multi-TeV scale, and realizes Higgs particle as composite Goldstone boson. The weak interactions are embedded in unbroken subgroup $Sp(4)$ spontaneously broken $SU(4)$ flavor group. meson resonances appear poles two-point correlators fermion bilinears, include bosons plus massive pseudoscalar ${\ensuremath{\eta}}^{\ensuremath{'}}$, well scalars, vectors axial vectors. compute mass spectrum these mesons, their decay...
At order ${\mathcal O}(\alpha G_{\mathrm F})$, the amplitudes for decays $K\to\pi \ell^+\ell^-$ involve a form factor given by matrix element of time-ordered product electromagnetic current with four-quark operators describing weak non-leptonic neutral-current transitions between kaon and pion. The short-distance behaviour this product, when considered at O}(\alpha_s)$ in perturbative expansion QCD, involves terms linear quadratic logarithm Euclidean momentum transfer squared. It is shown...