STUDY OF e + e − → ˜χ + 1 ˜χ − 1 → ˜τ+ 1 ντ + ˜τ −

Supersymmetry (SUSY) uniquely opens the possibility to directly connect the Standard Model (SM) with an ultimate unification of the fundamental interactions. A primary goal for linear colliders is a precise measurement of SUSY parameters if it would be discovered at Tevatron or LHC. One of the most challenging signatures in SUSY will be events involving τ leptons. At large tanβ values, we could have a particular mass hierarchy of M(l̃) > M(χ̃1 ) > M(τ̃ ± 1 ) > M(χ̃ 0 1), because a large mass splitting between τ̃1 and other sleptons (ẽ, μ̃, τ̃2, ν̃) can be generated via τ̃L − τ̃R mixing. Furthermore, Br(χ̃1 → τ̃1ντ ) = 100% if χ̃1 is gaugino-like. Thus, the experimental signature is 2τ ’s and missing energy and makes difficult to reconstruct the chargino mass. We here study χ̃+1 χ̃ − 1 → τ̃ 1 ντ + τ̃ 1 ντ in ee collisions within a framework of the Minimal Supersymmetric Standard Model (MSSM) by assuming a reaction of ee → τ̃ 1 τ̃ 1 , followed by τ̃ 1 → τχ̃1, is fully studied.