MOULTAKA Gilbert
Organisme : CNRS
Chargé de Recherche
Gilbert.Moultaka
umontpellier.fr
Bureau: 62, Etg: 1, Bât: 13 - Site : Campus Triolet
Administration Nationale: |
| Curriculum Vitae: |
Coordinateur de l'axe Physique Théorique. (2013-2015)
• co-direction du GDR Terascale
• coordinateur scientifique L2C, Labex-OCEVU
• comité exécutif Labex-OCEVU
• topic convener PASCOS2013,Tapei
• Membre ext. CS de l'IPNL
• Bureau National Théoriciens des Particules (prés.)
• coordination commission FOL, L2C |
Projets de Recherche: |
| • co-encadrement de 2 thèses |
Domaines de Recherche: - Physique/Physique des Hautes Energies - Phénoménologie
- Physique/Physique des Hautes Energies - Théorie
- Physique/Relativité Générale et Cosmologie Quantique
- Physique/Physique Quantique
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Dernieres productions scientifiques :
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The Higgs boson mass as fundamental parameter of the minimal supersymmetric standard model 
Auteur(s): El-Kosseifi Rima, Kneur J.-L., Moultaka G., Zerwas Dirk
(Article) Publié:
European Physical Journal C, vol. 82 p.657 (2022)
Texte intégral en Openaccess : 
Ref HAL: hal-03574108_v1
Ref Arxiv: 2202.06919
DOI: 10.1140/epjc/s10052-022-10606-4
WoS: WOS:000834632900001
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: In the Minimal Supersymmetric Standard Model (MSSM) the mass of the lightest neutral Higgs boson is determined by the supersymmetric parameters. In the $m_h$MSSM the precisely measured Higgs boson replaces the trilinear coupling $A_t$ as input parameter. Expressions are derived to extract $A_t$ in a semi-analytical form as a function of the light Higgs boson (pole) mass. An algorithm is developed and implemented at two--loop precision, generalizable to higher orders, to perform this inversion consistently. The result of the algorithm, implemented in the SuSpect spectrum calculator, is illustrated on a parameter set compatible with LHC measurements.
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Le Boson de Higgs
Auteur(s): Moultaka G.
(Séminaires)
Salle du Sénéchal, 17 rue de Rémusat, Toulouse (Toulouse, FR), 2020-02-26Texte intégral en Openaccess : 
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Vacuum stability conditions for Higgs potentials with SU(2)(L) triplets
Auteur(s): Moultaka G., C. Peyranère Michel
(Article) Publié:
Physical Review D, vol. 103 p.115006 (2021)
Texte intégral en Openaccess :
Ref HAL: hal-03087658_v1
Ref Arxiv: 2012.13947
DOI: 10.1103/PhysRevD.103.115006
WoS: WOS:000661786800005
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: Tree-level dynamical stability of scalar field potentials in renormalizable theories can in principle be expressed in terms of positivity conditions on quartic polynomial structures. However, these conditions cannot always be cast in a fully analytical resolved form, involving only the couplings and being valid for all field directions. In this paper we consider such forms in three physically motivated models involving SU (2) triplet scalar fields: the Type-II seesaw model, the Georgi-Machacek model, and a generalized two-triplet model. A detailed analysis of the latter model allows to establish the full set of necessary and sufficient boundedness from below conditions. These can serve as a guide, together with unitarity and vacuum structure constraints, for consistent phenomenological (tree-level) studies. They also provide a seed for improved loop-level conditions, and encompass in particular the leading ones for the more specific Georgi-Machacek case. Incidentally, we present complete proofs of various properties and also derive general positivity conditions on quartic polynomials that are equivalent but much simpler than the ones used in the literature.
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Standard Model singlets and hard susy breaking in N=1 Supergravity
Auteur(s): Moultaka G.
Conférence invité: 1 st Mediterranean Conference on Higgs Physics (MCHP) (Tanger, MA, 2019-09-23)
Texte intégral en Openaccess :
Ref HAL: hal-03090752_v1
Exporter : BibTex | endNote
Résumé: The standard lore has it that supersymmetry breaking in the visible sector is always soft when mediated by gravity from a hidden sector of Supergravity.Correspondingly, the associated generic forms of the superpotential and Kahler potential have long been the basis for the construction of consistent low energy susy models. In this talk we report on the existence of a whole class of new forms, equally consistent for low energy susy model building, but exhibiting hard susy breaking on top of the usual soft one. Moreover, these new forms require Standard Model gauge singlet chiral superfields displaying specific structures and flat directions. We discuss briefly the possible phenomenological spin-offs regarding the 125GeV Higgs fine-tuning issues and the (so far) non-discovery of susy particles, as well as next-to-minimal susy inflationary model-building. (based on G. Moultaka, M.R. de Traubenberg & D. Tant, Int.J.Mod.Phys. A34 (2019) no.01, 1950004, and work in progress).
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