### Abstract

We show that, unlike other pure b → d penguin processes, the decay B_{S}^{0}(t) → φK_{S} is dominated by a single amplitude, that of the internal t-quark. The contributions of the u- and c-quark operators each vanish due to a cancellation between the (V - A) ⊗ (V - A) and (V - A) ⊗ (V + A) matrix elements. Thus, the indirect CP asymmetry in this decay probes sin 2β. Although this cancellation is complete only for certain values of the s- and b-quark masses, the theoretical uncertainty on sin 2β is still less than 10% over most (∼ 80%) of the parameter space. By measuring the direct CP asymmetry, one can get a better idea of the probable error on sin 2β.

Original language | English |
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Pages (from-to) | 153-161 |

Number of pages | 9 |

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

Volume | 507 |

Issue number | 1-4 |

DOIs | |

Publication status | Published - 2001 May 17 |

### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

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## Cite this

_{s}

^{0}(t) → φK

_{s}.

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

*507*(1-4), 153-161. https://doi.org/10.1016/S0370-2693(01)00427-0