A5026250170- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Noncommutative and Quantum Gravity Theories
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Relativity and Gravitational Theory
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Smart Grid Security and Resilience
- International Science and Diplomacy
- Photocathodes and Microchannel Plates
- Nuclear Engineering Thermal-Hydraulics
- Quantum Mechanics and Applications
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Nuclear reactor physics and engineering
Laboratoire Univers et Particules de Montpellier
2023-2024
Centre National de la Recherche Scientifique
2006-2023
Université de Montpellier
2006-2023
Laboratoire Charles Coulomb
2012-2023
Laboratoire de Physique Théorique
1999-2012
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2012
Institut National de Physique Nucléaire et de Physique des Particules
2006-2008
Stanford University
1995
Bielefeld University
1991
Laboratoire de Mathématiques
1988-1990
A bstract We study the two photon decay channel of Standard Model-like component CP-even Higgs bosons present in type II Seesaw Model. The corresponding cross-section is found to be significantly enhanced parts parameter space, due (doubly-)charged bosons’ ( H ±± ) ± virtual contributions, while all other channels remain Model(SM)-like. In space (and interfere destructively, reducing branching ratio tremendously below SM prediction. Such properties allow account for any excess such as one...
Stable particle dark matter may well originate during the decay of long-lived relic particles, as recently extensively examined in cases axino, gravitino, and higher dimensional Kaluza–Klein (KK) graviton. It is shown that much viable parameter space such emerges naturally warm/hot or mixed. In particular, produced gravitinos (KK gravitons) only be considered cold for mass decaying several TeV range, unless are almost degenerate. Such candidates thus subject to a host cosmological...
Supersymmetric extensions of the standard model particle physics assuming gravitino to be lightest supersymmetric (LSP), and with next-to-LSP (NLSP) decaying during big bang nucleosynthesis (BBN), are analyzed. Particular emphasis is laid on their potential solve ``$^{7}\mathrm{Li}$ problem,'' observations leading an apparent 2 4 overproduction $^{7}\mathrm{Li}$ respect predictions, production cosmologically important amounts $^{6}\mathrm{Li}$, as well resulting dark matter densities in...
We present the results obtained by "Triple Gauge Couplings" working group during LEP2 Workshop (1994-1995). The report concentrates on measurement of $WWγ$ and $WWZ$ couplings in $e^-e^+\to W^-W^+$ or, more generally, four-fermion production at LEP2. In addition detection new interactions bosonic sector via other channels is discussed.
CONTENTS: 1. Synopsis, 2. The MSSM Spectrum, 3. Physical Parameters, 4. Higgs Boson Production and Decays, 5. SUSY Particle 6. Experimental Bounds on Masses, 7. References.
This paper investigates the parameter space of theories with gauge-mediated supersymmetry breaking leading to gravitino (cold) dark matter mass ${m}_{3/2}\ensuremath{\sim}1\text{ }\text{ }\mathrm{keV}\ensuremath{\rightarrow}10\text{ }\mathrm{MeV}$. We pay particular attention cosmological role messenger fields. Cosmology requires that these messengers decay visible sector if lightest ${M}_{X}\ensuremath{\gtrsim}30\text{ }\mathrm{TeV}$. then examine various possible number violating...
We examine the possibility of recovering supersymmetric (and soft supersymmetry breaking) Lagrangian parameters as direct analytical expressions appropriate physical masses, for unconstrained (but $\mathrm{CP}$- and $R$-parity conserving) minimal standard model. concentrate mainly on algebraically non-trivial ``inversion'' gaugino parameters, obtain, given values $\mathrm{tan}\ensuremath{\beta},$ simple \ensuremath{\mu}, ${M}_{1}$ ${M}_{2}$ in terms three arbitrary input namely either two...
We establish explicit analytic expressions for the e + − → W cross sections, asymmetries and ± spin density matrix elements in terms of complete set anomalous three-boson couplings. This should be useful performing a model-independent analysis LEP 2 or future high energy collider data. Sensitivities to various couplings are discussed possible ways disentangle their effects proposed.
We consider recovering analytically the (generally complex) parameters $\mu$, $M_1$ and $M_2$ of gaugino Higgsino Lagrangian, from appropriate physical input in chargino neutralino sectors. For given $\tan\beta$, we obtain very simple analytic solutions for $M_2$, $| \mu|$, $Arg[\mu]$ sector a twofold M_1 |$, $Arg[M_1]$ solution sector, assuming two chargino, masses, one mixing angles as input. The ambiguity reconstruction may be essentially resolved by measuring $e^+e^- \to \chi^0_1...
We investigate the production of Higgs particles in association with supersymmetric scalar partners top quark at proton colliders. In minimal extension Standard Model, cross sections for lightest neutral boson squark pairs can be rather large, substantially exceeding rate associated quarks. If is not much heavier than quark, this process will enhance potential CERN Large Hadron Collider to discover boson, and open a window study Higgs-stop coupling, potentially largest electroweak coupling theory.
We consider a four dimensional space-time symmetry which is non trivial extension of the Poincar\'e algebra, different from supersymmetry and not contradicting {\sl priori} well-known no-go theorems. investigate some field theoretical aspects this new construct invariant actions for non-interacting fermion boson multiplets. In case bosonic multiplet, where two-form fields appear naturally, we find that compatible with local U(1) gauge symmetry, only when latter fixed by `t Hooft-Feynman term.
Tree-level dynamical stability of scalar field potentials in renormalizable theories can principle be expressed terms positivity conditions on quartic polynomial structures. However, these cannot always cast a fully analytical resolved form, involving only the couplings and being valid for all directions. In this paper we consider such forms three physically motivated models $SU(2)$ triplet fields: Type-II seesaw model, Georgi-Machacek generalized two-triplet model. A detailed analysis...
On the basis of recent results extending non-trivially Poincar\'e symmetry, we investigate properties bosonic multiplets including $2-$form gauge fields. Invariant free Lagrangians are explicitly built which involve possibly $3-$ and $4-$form We also study in detail interplay between this symmetry a U(1) particular implications automatic gauge-fixing latter associated to residual invariance, as well absence self-interaction terms.