Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-ph
Date Mardi 21 Septembre 2021
Heure 14:00
Institut LPTHE
Salle Library & Zoom link in comments
Nom de l'orateur Passehr
Prenom de l'orateur Sebastian
Addresse email de l'orateur
Institution de l'orateur RWTH Aachen U.
Titre Precision Higgs decays in the (N)MSSM
Résumé In view of increasingly precise measurements of observables in Higgs physics, equally precise theory predictions are required in order to distinguish models that correctly describe nature. In supersymmetric extensions of the Standard Model higher-order corrections to Higgs-boson masses or decay widths can be sizable. The most important corrections are typically of QCD type, but after the advances in recent years also electroweak corrections become important. However, some parameters of the extended Higgs sector are related to the gauge sector and not free parameters due to supersymmetry. As a consequence not all Higgs fields can be renormalised on-shell and therefore mix among one another. Since this mixing is scheme and gauge dependent, the fate of electroweak loop corrections is a priori unclear. At the example of the (N)MSSM, I will compare the strict perturbative expansion and the Z-matrix formalism for the description of Higgs mixing at higher order. I will address the cancellation of unphysical degrees of freedom in Higgs decay widths at the analytical level and also show its relevance at the numerical level. Finally, I will illustrate some limitations of the derived methods in scenarios with light singlet-dominated Higgs states and propose different possible solutions.
Numéro de preprint arXiv
Commentaires Zoom link: Meeting ID: 664 3879 4649 Passcode: 730460
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