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We discuss the possible enhancement of the tau lepton events at LHC when theleft-handed stau doublet becomes light (which can be even lighter than theright-handed stau). This is illustrated in the constrained supersymmetricseesaw model where the slepton doublet mass is suppressed by the effects of alarge neutrino Yukawa coupling. We study a few representative parameter sets inthe sneutrino coannihilation regions where the tau sneutrino is NLSP and thestau coannihilation regions where the stau is NLSP both of which yield thethermal neutralino LSP abundance determined by WMAP.

Enhanced Tau Lepton Signatures at LHC in Constrained Supersymmetric Seesaw