Decay rate asymmetry inB→Xsγas a signature of supersymmetry

Abstract

In the supersymmetric standard model, the radiative B-meson decay $\stackrel{\ensuremath{\rightarrow}}{B}{X}_{s}\ensuremath{\gamma}$ could receive a large contribution from a new source of flavor-changing neutral current, which also violates $\mathrm{CP}$ invariance. The $\mathrm{CP}$-conjugate processes then may sizably differ in decay width. If a new $\mathrm{CP}$-violating phase is not suppressed, this decay rate asymmetry can be significantly larger than the prediction by the standard model, possibly detectable at B factories. Such a large asymmetry may be implied by the measured branching ratio which is consistent with the standard model.