We investigate the effect of general flavour mixing among squarks on the rare decays B̄→Xsγ, B̄s→μ+μ- and B̄s-Bs mixing beyond the leading order in perturbation theory. We include all large tanβ-enhanced corrections whilst also taking into account the effects of general flavour mixing on the uncorrected quark mass matrix and SU(2)L×U(1)Y breaking. For B̄s→μ+μ- and B̄s-Bs mixing we find that, in analogy to B̄→Xsγ, there appears a focusing effect which can reduce the contribution due to the δRR (and the δLL) insertion by up to a factor of two at large tanβ and μ>0. A dependence on δLR and δRL, that otherwise cancels to first order in the mass insertion approximation, is also reintroduced. Taking into account the current experimental bounds on ΔMBs and BR(B̄s→μ+μ-), we find that the insertions δRL and δRR can be significantly constrained compared to bounds obtained from B̄→Xsγ only.
|Number of pages||9|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - Mar 3 2005|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics