PUB - Publikationen an der Universität Bielefeld

Electroweak baryogenesis is an attractive scenario for the generation of thebaryon asymmetry of the universe as its realization depends on the presence atthe weak scale of new particles which may be searched for at high energycolliders. In the MSSM it may only be realized in the presence of light stops,and with moderate or small mixing between the left- and right-handedcomponents. Consistency with the observed Higgs mass around 125 GeV demands theheavier stop mass to be much larger than the weak scale. Moreover the lighterstop leads to an increase of the gluon-gluon fusion Higgs production crosssection which seems to be in contradiction with indications from current LHCdata. We show that this tension may be considerably relaxed in the presence ofa light neutralino with a mass lower than about 60 GeV, satisfying all presentexperimental constraints. In such a case the Higgs may have a significantinvisible decay width and the stop decays through a three or four body decaychannel, including a bottom quark and the lightest neutralino in the finalstate. All these properties make this scenario testable at a high luminosityLHC.