Radiative corrections to chargino production in electron-positron collisions Original Research Article

We discuss the one-loop radiative corrections to the reaction σ(e+e− → χa+χb−), for a, b = 1, 2 where χ±1,2 are the charginos of the minimal supersymmetric standard model. We calculate the leading one-loop radiative corrections involving loops of top, stop, bottom and sbottom quarks, working in the DR scheme. At LEP2 we find radiative correct ions with either sign varying between −9% and 24% if the squark mass parameters are of the order of 1 TeV. If s = 500 GeV radiative corrections are comparable, with extreme values of −22% and 28%. For a centre-of-mass given by s = 2 TeV we find larger corrections. For particular values of the MSSM parameters these can vary between −43% and 91%.