A5081637892- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Spacecraft and Cryogenic Technologies
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Education Pedagogy and Practices
- Nuclear physics research studies
- International Science and Diplomacy
- Education and Public Policy
- Engineering and Test Systems
- Advanced NMR Techniques and Applications
- Data Mining Algorithms and Applications
- VLSI and Analog Circuit Testing
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
Centre National de la Recherche Scientifique
2015-2024
Institut National de Physique Nucléaire et de Physique des Particules
2015-2024
Laboratoire de Physique Corpusculaire
2010-2023
Clermont Université
2018-2022
Université Clermont Auvergne
2018-2021
Centre de Gestion Scientifique
2019
Laboratoire de Physique Théorique
2007-2010
Instituto Superior Técnico
2001-2010
Université Paris-Saclay
2008-2010
Université Paris Cité
2007-2009
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...
A future high-luminosity Z-factory will offer the possibility to study rare Z decays, as those leading lepton flavour violating final states. Processes such → ℓ 1 ∓ 2 ± are potentially complementary low-energy (high-intensity) observables of violation. In this work we address impact new sterile fermions on focusing potential searches at FCC-ee (TLEP), and taking into account experimental observational constraints We consider a minimal extension Standard Model by one fermion state, two...
We address the impact of a modified $W \ell \nu$ coupling on wide range observables, such as $\tau$ leptonic and mesonic decays, decays pseudoscalar mesons, well semileptonic meson decays. In particular, we concentrate deviations from lepton flavour universality, focusing ratios $R_{P} = \Gamma (P \to \nu) / \ell' \nu)$, with $P=K, \pi, D, D_s$, $R(D)={\Gamma (B^+ D \tau^+ \nu)}/{\Gamma D\ell^+ \nu)}$, $R \tau={\Gamma (\tau\to \mu\nu\nu)}/{\Gamma e\nu\nu)}$, $R^{\ell \tau}_P=\Gamma(\tau\to...
We consider a tree-level enhancement to the violation of lepton flavour universality in light meson decays arising from modified $W \ell \nu$ couplings standard model minimally extended by sterile neutrinos. Due presence additional mixings between active (left-handed) neutrinos and new states, deviation unitarity leptonic mixing matrix intervening charged currents might lead $R_{P} = \Gamma (P \to e \nu) / \mu \nu)$, with $P=K, \pi$. illustrate these enhancements case inverse seesaw model,...
We discuss charged lepton flavour violating processes occurring in the presence of muonic atoms, such as muon-electron conversion nuclei CR(μ − e, N), (Coulomb enhanced) decay atoms into a pair electrons BR(μ e → −, well Muonium and decay, Mu $$ \overline{\mathrm{Mu}} + −. Any experimental signal these observables calls for scenarios physics beyond Standard Model. In this work, we consider minimal extensions Model via addition sterile fermions, providing corresponding complete analytical...
An observation of any lepton number violating process will undoubtedly point towards the existence new physics and indirectly to clear Majorana nature exchanged fermion. In this work, we explore potential a minimal extension Standard Model via heavy sterile fermions with masses in $[ 0.1 - 10]$ GeV range concerning an extensive array "neutrinoless" meson tau decay processes. We assume that neutrinos are produced on-shell, focus on three-body decays. conduct update bounds active-sterile...
A light singlino in the NMSSM can reduce considerably missing transverse energy at end of sparticle decay cascades; instead, NMSSM-specific Higgs bosons be produced. Such scenarios consistent with present constraints from LHC all masses below ∼1 TeV. We discuss search strategies, which do not rely on energy, for such next run near 14
A bstract Motivated by a simultaneous explanation of the apparent discrepancies in light charged lepton anomalous magnetic dipole moments, and internal pair creation 8 Be nuclear transitions, we explore simple New Physics model, based on an extension Standard Model gauge group U(1) B−L . The model further includes heavy vector-like fermion fields, as well extra scalar responsible for low-scale breaking , which gives rise to Z′ boson. new fields currents allow explain while being consistent...
A bstract Within the context of heavy neutral lepton (HNL) extensions Standard Model, we compute cross-sections for $$ {\mu}^{+}{e}^{-}\to {\ell}_{\alpha}^{+}{\ell}_{\beta}^{-} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>e</mml:mi> <mml:mo>−</mml:mo> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>ℓ</mml:mi> <mml:mi>α</mml:mi> </mml:msubsup> <mml:mi>β</mml:mi> </mml:math> scattering, as well several angular...
We address the impact of sterile fermion states on anomalous magnetic moment charged leptons, as well their contribution to neutrinoless double beta decays. illustrate our results in a minimal, effective extension Standard Model by one state, and well-motivated framework neutrino mass generation, embedding Inverse Seesaw into Model. The simple "3+1" case succeeds alleviating tension related muon moment, albeit only at 3σ level, for light (corresponding cosmologically disfavoured regime)....
The European Particle Physics Strategy Update (EPPSU) process takes a bottom-up approach, whereby the community is first invited to submit proposals (also called inputs) for projects that it would like see realised in near-term, mid-term and longer-term future. National inputs as well from Laboratories are also an important element of process. All these then reviewed by Preparatory Group (PPG), whose role organize Symposium around submitted ideas prepare discussion on importance merits...
We systematically investigate constraints on the parameters of supersymmetric type-I seesaw mechanism from requirement successful thermal leptogenesis in presence upper bounds reheat temperature TRH early Universe. To this end, we solve flavour-dependent Boltzmann equations MSSM, extended to include reheating. With conservative TRH, leading mildly constrained scenarios for leptogenesis, compatibility with observation can be obtained extensive new regions parameter space, due effects. On...
The viability of the lightest neutralino as a dark matter candidate in Next-to-Minimal Supersymmetric Standard Model is analysed. We carry out thorough analysis parameter space, taking into account accelerator constraints well bounds on low-energy observables, such muon anomalous magnetic moment and rare $K$ $B$ meson decays. relic density also evaluated consistency with present imposed. Finally, direct detection cross section calculated allowed regions space compared to sensitivities...
In the framework of NMSSM with a singlino-like LSP, we study quantitatively impact additional bino -> singlino cascade on efficiencies in several search channels for supersymmetry ATLAS and CMS collaborations. Compared to MSSM, reduces missing transverse energy, but leads jets or leptons. For benchmark lines which generalize cMSSM points, most relevant 2/3 jet + energy can drop by factors ~1/3 ~1/7, reduce present lower bounds M_{1/2} as much ~0.9 - 0.75 large bino-singlino mass differences....
A bstract Motivated by an explanation of the $$ {R}_{K^{\left(*\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> anomalies, we propose a Standard Model extension via two scalar SU(2) L triplet leptoquarks and three generations Majorana fermions. The gauge group is reinforced Z 2 symmetry, ensuring stability lightest -odd particle,...
In the case where Standard Model is extended by one heavy Majorana fermion, branching fractions of semileptonic meson decays into same-sign and opposite-sign dileptons are expected to be same order. As we discuss here, this need not in extensions at least two sterile fermions, due possible destructive constructive interferences that might arise. Depending on $CP$ violating phases, can have an enhancement lepton number modes suppression conserving ones (and vice-versa). We explore for first...
Heavy neutral leptons are motivated by several extensions of the Standard Model and their presence induces modifications in lepton mixing matrix, including new Dirac Majorana CP violating phases. It has been recently shown that these phases play an important role number flavour decays transitions, with a striking impact for predicted rates certain observables. In this work, we now consider potential heavy fermions Higgs $Z$-boson $H,Z\to \ell_\alpha^\pm\ell_\beta^\mp$, as well corresponding...
We consider the fully constrained version of next-to-minimal supersymmetric extension standard model (cNMSSM) in which a singlet Higgs superfield is added to two doublets that are present minimal (MSSM). Assuming universal boundary conditions at high scale for soft supersymmetry-breaking mass parameters as well trilinear interactions, we find more than celebrated supergravity model. The phenomenologically viable region parameter space cNMSSM corresponds small value scalar ${m}_{0}$: this...