Mass and Cross-section Measurements of Chargino at Linear Colliders in Large tan(beta) Case

Abstract

The lighter chargino pair production ($e^{+}{e}^{-}\to {\tilde{\chi }}_1^{+}{\tilde{\chi }}_1^{-}$) is one of key processes for determination of supersymmetric parameters at a linear collider. If $\tan \beta$ is a large value, the lighter stau (${\tilde{\tau }}_1^{\pm }$) might be lighter than the ${\tilde{\chi }}_1^{\pm }$, while the other sleptons stay heavier. This case leads a cascade decay, ${\tilde{\chi }}_1^{\pm }\to {\tilde{\tau }}_1^{\pm }{\nu }_{\tau }$ followed by ${\tilde{\tau }}_1^{\pm }\to {\tilde{\chi }}_1^0{\tau }^{\pm }$, where ${\tilde{\chi }}_1^0$ is the lightest supersymmetric particle. This paper addresses to what extent this cascade decay may affect the measurements of the chargino mass and its production cross section.

11 pages, 3 figures, 2 tables, will be published Physics Letters, B