Measuring sin 2β in Bs0(t) → φKs

Alakabha Datta, C. S. Kim, David London

Research output: Contribution to journalArticle

2 Citations (Scopus)


We show that, unlike other pure b → d penguin processes, the decay BS0(t) → φKS 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 languageEnglish
Pages (from-to)153-161
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-4
Publication statusPublished - 2001 May 17

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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