### Abstract

We discuss two dedicated observables in exclusive B → K*ℓ+ℓ- decay that can be used to study effects of physics beyond the standard model, namely the forward-backward asymmetry in the lepton spectrum and the isospin-asymmetry between decays of charged and neutral B mesons. We consider the region of large recoil-energy (i.e. small invariant mass of the lepton pair), and employ the QCD factorization approach to exclusive B meson decays. Sub-leading effects in the heavy quark mass expansion are taken into account for the calculation of the isospin-asymmetry. We give predictions for decay asymmetries in the standard model, and its supersymmetric extension with minimal flavor violation, using parameter values allowed by current experimental constraints on B →X sγ decay. © SISSA/ISAS 2003.

Original language | English |
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Pages (from-to) | 1607-1629 |

Journal | Journal of High Energy Physics |

Volume | 7 |

Issue number | 1 |

Publication status | Published - 1 Jan 2003 |

### Keywords

- B-Physics
- NLO Computations
- Rare Decays

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## Cite this

Feldmann, T., & Matias, J. (2003). Forward-backward and isospin asymmetry for B → K *ℓ

^{+}ℓ^{-}decay in the standard model and in supersymmetry.*Journal of High Energy Physics*,*7*(1), 1607-1629.