Radiative corrections to neutralino and chargino masses in the minimal supersymmetric model

Abstract

We determine the neutralino and chargino masses in the MSSM at one loop. We perform a Feynman diagram calculation in the on-shell renormalization scheme, including quark-squark and lepton-slepton loops. We find generically the corrections are of the order of 5%. For a 20 GeV neutralino the corrections can be as large as 20%. The corrections change the region of \ensuremath{\mu}, ${\mathit{M}}_{2}$, tan\ensuremath{\beta} parameter space which is ruled out by CERN LEP data. We demonstrate that, e.g., for a given \ensuremath{\mu} and tan\ensuremath{\beta} the lower limit on the parameter ${\mathit{M}}_{2}$ can shift by 20 GeV.