Neutralino polarization effect in the squark cascade decay at LHC

Abstract

We study the effect of the neutralino polarization in a squark cascade decay $\tilde{q}\to q{\tilde{\chi }}_2^0\to q{l}^{\pm }{\tilde{l}}^{\mp }\to q{l}^{\pm }{\tilde{l}}^{\mp }\to q{l}^{\pm }{l}^{\mp }{\tilde{\chi }}_1^0$. Charge asymmetry in the lepton-jet invariant mass distribution appears depending on the chirality structure of the sfermion-fermion-neutralino coupling. With use of the Monte Carlo simulation, we show that the asymmetry is measurable in LHC. We also show that the distribution of the charge asymmetry is sensitive to the (s)lepton flavor.

Comments: 4 pages. Talk given at the 12th International Conference on Suypersymmetry and Unification of the Fundamental Interactions (SUSY04), June 17-23, 2004, in Epochal Tsukuba, Tsukuba, Japan