SEMINAR
Measuring Lepton Flavour Violation at LHC with Long-Lived Slepton in the Coannihilation Region
Takashi Shimomura
(Uni. Valencia, IFIC, Spain)
Sala P7, IST, EdifĂcio Matemática
Tuesday, November 25th, 2008 at 04:00 PM
Abstract
When the mass difference between the lightest slepton, the NLSP, and the
lightest neutralino, the LSP, is smaller than the tau mass, the lifetime of
the lightest slepton increases in many orders of magnitude with respect to
typical lifetimes of other supersymmetric particles.
These small mass differences are possible in the MSSM and, for instance,
they correspond to the coannihilation region of the CMSSM for
M_{1/2} > 700 GeV. In a general gravity-mediated MSSM, where the lightest
supersymmetric particle is the neutralino, the lifetime of the lightest
slepton is inversely proportional to the square of the intergenerational
mixing in the slepton mass matrices.
Such a long-lived slepton would produce a distinctive signature at LHC and a
measurement of its lifetime would be relatively simple. Therefore, the long-lived
slepton scenario offers an excellent opportunity 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.
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