A Strong Phase Transition at the Weak Scale within the U(1)-Extended MSSM

par Amine Ahriche (Université de Jijel)

jeudi 27 janv. 2011, 11:00 → 12:00 Europe/Paris

Auditorium M. Vivargent (LAPTH)

In this work, we have investigated the nature of the electroweak phase transition (EWPT) in the U(1) extended Minimal Supersymmetric Standard Model (UMSSM) without introducing any exotic fields. The effective potential has been estimated exactly at finite temperature taking into account the whole particle spectrum. For reasonable values of the lightest Higgs and neutralino, we found that the EWPT could be strongly first order due to: 1) the interactions of the singlet with the doublets in the effective potential, and 2) the evolution of the wrong vacuum, that delays the transition.

Slides Ahriche