### Abstract

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.

Original language | English |
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Pages (from-to) | 102-110 |

Number of pages | 9 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 609 |

Issue number | 1-2 |

DOIs | |

Publication status | Published - Mar 3 2005 |

### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

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## Cite this

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,

*609*(1-2), 102-110. https://doi.org/10.1016/j.physletb.2004.12.050