Statut  Confirmé 
Série  LPTHEPPH 
Domaines  hepph 
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 higherorder corrections to Higgsboson 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 onshell 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 Zmatrix 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 singletdominated Higgs states and propose different possible solutions. 
Numéro de preprint arXiv  
Commentaires  Zoom link: https://cern.zoom.us/j/66438794649?pwd=Mk1XSTlXcWRwZjlJTWZyZVRISkJPZz09 Meeting ID: 664 3879 4649 Passcode: 730460 
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