Radiative corrections to sfermion mass splittings

Abstract

We study the one-loop radiative corrections to the SU(2) breaking mass splittings between sfermions in SU(2) doublets in the Minimal Supersymmetric Standard Model. At tree-level, the differences of mass squared $m_{{\tilde{f}}_{1L}}^2-m_{{\tilde{f}}_{2L}}^2$ of SU(2) doublet sfermions $({\tilde{f}}_1,{\tilde{f}}_2{)}_L$ in the first two generations are determined by $\tan \beta$, and are universal to sleptons and squarks. The radiative correction, however, breaks this relation. The typical deviation from the universality between sleptons and squarks is within $\pm 0.05$ in terms of the ``effective $\cos 2\beta$''. We also study the SUSY parameter dependence of the deviation. For very heavy sfermions, the relative corrections become large.

Comments: 11 pages (LaTeX) and 8 figures (postscript), to be published