Impact of bosonic decays on the search for and

We perform a detailed study of the decays of the heavier τ slepton ( τ 2 ) and τ-sneutrino ( ν τ ) in the Minimal Supersymmetric Standard Model (MSSM). We show that the decays into Higgs or gauge bosons, i.e. τ − 2 → τ − 1 +(h 0 ,H 0 ,A 0 or Z 0 ) , τ − 2 → ν τ +(H − or W − ) , and ν τ → τ − 1 +(H + or W + ) , can be very important due to the sizable τ Yukawa coupling and large mixing parameters of τ . Compared to the decays into fermions, such as τ − 2 →τ − + χ 0 i and τ − 2 →ν τ + χ − j , these bosonic decay modes can have significantly different decay distributions. This could have an important influence on the search for τ 2 and ν τ and the determination of the MSSM parameters at future colliders.