Relaxing b→sγ constraints on the supersymmetric particle mass spectrum

We consider the radiative decay b→sγ 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→sγ amplitude from the charged Higgs-boson and the charginos/neutralinos are suppressed by 1/tan2β and O(α/αs), 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.