Long-lived Slepton in the MSSM and Measurement of Lepton Flavor Violation at LHC

por Takashi Shimomura (Dept. Fisica Teorica and IFIC)

miércoles 19 nov. 2008 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

When the mass difference of the lightest slepton and the lightest neutralino is smaller than the tau mass, the lifetime of the slepton increases in many orders of magnitude with respect to typical lifetimes of other supersymmetric particles. This small mass differences are possibe in the MSSM and, for instance, they correspond to the coannihilation region of the CMSSM for $M_{1/2} \gsim 700$ GeVs. In a general gravity-mediated MSSM, where the lightest supersymmetric particle is the neutralino, this lifetime is inversely proportional to the intergenerational mixing in the slepton mass matrices. Such a long-lived slepton would produce a distinctive signature at LHC and a measure of its lifetime would be relatively simple. Therefore, the long-lived slepton scenario offers an excellent oportunity to study lepton flavour violation at ATLAS and CMS detectors in the LHC and an improvement of the leptonic mass insertion bounds by more than five orders of magnitude would be possible.