Studies on chargino production and decay at a photon collider

A Monte-Carlo analysis on production and decay of supersymmetric charginos at a future photon-collider is presented. A photon collider offers the possibility of a direct branching-ratio measurement. In this study, the process \( \gamma \gamma \to \tilde{\chi }^{ + }_{1} \tilde{\chi }^{ - }_{1} \to W^{ + } W^{ - } \tilde{\chi }^{0}_{1} \tilde{\chi }^{0}_{1} \to q\bar{q}q\bar{q}\tilde{\chi }^{0}_{1} \tilde{\chi }^{0}_{1} % \) has been considered for a specific mSUGRA scenario. Various backgrounds and a parameterised detector simulation have been included. Depending on the centre-of-mass energy, a statistical error for the directly measurable branching ratio BR(\({\tilde{\chi}_1^\pm}\rightarrow {\tilde{\chi}_1^0} W^\pm\)) of up to 3.5% can be reached.