A5041277450- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Cold Atom Physics and Bose-Einstein Condensates
- High-Energy Particle Collisions Research
- International Science and Diplomacy
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Advanced Frequency and Time Standards
- Atomic and Molecular Physics
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Quantum optics and atomic interactions
- Astrophysics and Cosmic Phenomena
- Muon and positron interactions and applications
- Quantum Information and Cryptography
- Earth Systems and Cosmic Evolution
- Scientific Computing and Data Management
- Advanced Data Storage Technologies
- Cryptographic Implementations and Security
- Advanced NMR Techniques and Applications
- Molecular spectroscopy and chirality
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2014-2025
European Organization for Nuclear Research
2008-2025
CEA Paris-Saclay
2007-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2007-2025
Weizmann Institute of Science
2009-2025
Institut de Physique Théorique
2007-2025
Centre National de la Recherche Scientifique
2014-2023
Université Savoie Mont Blanc
2015-2020
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...
This report presents a short summary of the activities "Standard Model" working group for "Physics at TeV Colliders" workshop (Les Houches, France, 12-30 June, 2023).
We show that the recently reported anomalies in $b\ensuremath{\rightarrow}s{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ transitions, as well long-standing ${g}_{\ensuremath{\mu}}\ensuremath{-}2$ discrepancy, can be addressed simultaneously by a new massive Abelian gauge boson with loop-induced coupling to muons. Such scenario typically leads stable dark matter candidate thermal relic density close observed value. Dark our model couples dominantly leptons, hence signals direct...
In composite Higgs models (CHMs), electroweak precision data generically push colourless vector resonances to a regime where they dominantly decay into pairs of light top partners. This greatly attenuates their traces in canonical collider searches, tailored for narrow promptly decaying Standard Model final states. By reinterpreting the CMS same-sign dilepton (SS2ℓ) analysis at Large Hadron Collider (LHC), originally designed search partners with electric charge 5/3, we demonstrate its...
We explore a method to probe new long- and intermediate-range interactions using precision atomic isotope shift spectroscopy. develop formalism interpret linear King plots as bounds on physics with minimal theory inputs. focus only bounding the contributions that can be calculated independently of standard model nuclear effects. apply our existing Ca^{+} data project its sensitivity conjectured bosons spin-independent couplings electron neutron narrow transitions in other atoms ions,...
We propose a novel approach to probe new fundamental interactions using isotope shift spectroscopy in atomic clock transitions. As concrete toy example we focus on the Higgs boson couplings building blocks of matter: electron and up down quarks. show that attractive force between nuclei their bound electrons, which is poorly constrained, might induce effects are larger than current experimental sensitivities. More generically, discuss how neutrons, mediated via light degrees freedom, may...
A warped extra-dimensional model, where the Standard Model Yukawa hierarchy is set by UV physics, shown to have a sweet spot of parameters with improved experimental visibility and possibly naturalness. Upon marginalizing over all model parameters, Kaluza-Klein scale 2.1 TeV can be obtained at 2 sigma (95.4 CL) without conflicting electroweak precision measurements. Fitting relevant simultaneously relax this bound 1.7 TeV. In bulk version Rattazzi-Zaffaroni shining flavor violation also...
We show that current Higgs data permit a significantly enhanced coupling to charm pairs, comparable the bottom pairs in Standard Model, without resorting additional new physics sources production. With mild level of latter even allow for be dominant decay channel. An immediate consequence such large is significant reduction signal strengths into known final states as particular pairs. This might reduce visible vector-boson associated production rate could compromise prospects ever observing...
A bstract We point out that Higgs rates into gauge bosons can be significantly modified in composite pseudo Nambu-Goldstone boson (pNGB) models if quarks belonging to the first two generation are relatively objects as well. Although lightness of latter a priori screen them from electroweak symmetry breaking sector, we show, an effective two-site description, their partners lead order one shifts radiative couplings gluons and photons. Moreover, due pseudo-Goldstone nature boson, size these...
The very high precision of current measurements and theory predictions spectral lines in few-electron atoms allows to efficiently probe the existence exotic forces between electrons, neutrons protons. We investigate sensitivity new spin-independent interactions transition frequencies (and their isotopic shifts) hydrogen, helium some helium-like ions. find that present data regions force-carrier couplings electrons around MeV mass range. also that, below few keV, electron coupling...
Atomic spectral lines for different isotopes are shifted, revealing a change in the properties of nucleus. For spinless nuclei such isotope shifts two distinct transitions expected to be linearly related, at least leading order nuclear mass and charge distribution. Looking breaking linearity so-called King plots was proposed as novel method search physics beyond standard model. In light recent experimental progress shift spectroscopy, sensitivity these searches will become limited by...
Anarchic warped extra dimensional models provide a solution to the hierarchy problem. They can also account for observed flavor hierarchies, but only at expense of little and CP problems, which naturally require Kaluza–Klein (KK) scale beyond LHC reach. We have recently shown that when issues are decoupled, assumed be solved by UV physics, framework's parameter space greatly opens. Given possibility lower KK composite light quarks, this class triviality enjoys rather exceptional...
A bstract Recently the LHCb collaboration reported evidence for direct CP violation in charm decays. The value is sufficiently large that either substantially enhanced Standard Model contributions or non-Standard physics required to explain it. In latter case only a limited number of possibilities would be consistent with other existing flavor-changing constraints. We show warped extra dimensional models quark spectrum through flavor anarchy can naturally give rise size result. D meson...
We study the phenomenological implications of a large degree compositeness for light generation quarks in composite pseudo-Nambu-Goldstone-boson Higgs models. focus particular on phenomenologically viable scenarios where right-handed up-type have sizable mixing with strong dynamics. For concreteness we assume latter to be characterized by an SO(5)/SO(4) symmetry fermionic resonances SO(4) singlet and fourplet representations. Singlet partners dominantly decay boson jets. Since no dedicated...
Fundamental physical constants are determined from a collection of precision measurements elementary particles, atoms, and molecules. This is usually done under the assumption standard model (SM) particle physics. Allowing for light new physics (NP) beyond SM modifies extraction fundamental constants. Consequently, setting NP bounds using these data, at same time assuming Committee on Data International Science Council recommended values constants, not reliable. As we show in this Letter,...
We explore the possibility that interactions of a light scalar singlet, which mixes with Standard Model~(SM) Higgs, also receive other UV contributions comparable size. focus, in particular, on flavor aligned limit, where couplings to SM are almost diagonal, but not necessarily proportional Higgs Yukawa couplings. The phenomenology such general differs from both Higgs-mixed scalar, as well axion-like particle. this for masses below few hundred MeV, they can be produced kaon decays, and...
New physics at a high scale Λ can affect top-related observables O(1/Λ2) via the interference of effective four quark operators with SM amplitude. The (u¯γμγ5Tau)(t¯γμγ5Tat) operator modifies large Mtt¯ forward–backward asymmetry, and account for recent CDF measurement. (u¯γμTau)(t¯γμTat) differential cross section, but cannot enhance section ultra-massive boosted jets by more than 60%. hint larger enhancement from measurement may not persist future experimental improvements, or be QCD...
We present a thorough analysis of the sequential freeze-in mechanism for dark matter production in early universe. In this relic density results from pair annihilation mediator particles which are themselves produced by thermal collisions standard model particles. Below some critical value coupling to fields, channel dominates over usual where is directly collisions, even when not equilibrium. The latter case requires computing full non-thermal distribution mediators, finite temperature...
We study the stability of Higgs potential in framework effective Lagrangian beyond minimal supersymmetric standard model (MSSM). While leading nonrenormalizable operators can shift boson mass above experimental bound, they also tend to render scalar unbounded from below. The destabilization is correlated with increase, so that if quantum corrections are small problem severe. show a subleading correction stabilizes within domain validity theory. Constraints on MSSM parameters as well higher...
We present a class of warped extra dimension (composite Higgs) models which conjointly accommodates the t\bar t forward-backward asymmetry observed at Tevatron and direct CP in singly Cabibbo suppressed D decays first reported by LHCb collaboration. argue that both asymmetries, if arising dominantly from new physics beyond Standard Model, hint for flavor paradigm within partial compositeness right-handed quarks two generations are not elementary fields but rather composite objects. show this...