Relaxing b\to s\gamma Constraints on the Supersymmetric Particle Mass Spectrum

Abstract

We consider the radiative decay b \to s \gamma in a supersymmetric extension of the standard model of particle interactions, where the $b$-quark mass is entirely radiative in origin. This is accomplished by the presence of nonholomorphic soft supersymmetry breaking terms in the Lagrangian. As a result, the contributions to the b \to s \gamma amplitude from the charged Higgs boson and the charginos/neutralinos are suppressed by 1/\tan^2\beta and {\cal O}(\alpha/\alpha_s) respectively, allowing these particles to be lighter than in the usual supersymmetric model. Their radiatively generated couplings differ from the usual tree-level ones and change the collider phenomenology drastically. We also study how this scenario may be embedded into a larger framework, such as supersymmetric SU(5) grand unification.