Measuring sin 2β in Bs0(t) → φKs

Alakabha Datta, C. S. Kim, David London

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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

Bibliographical note

Funding Information:
C.S.K. thanks D.L. for the hospitality of the Université de Montréal, where some of this work was done. The work of C.S.K. was supported in part by the BK21 Program, SRC Program and Grant No. 2000-1-11100-003-1 of the KOSEF, and in part by the KRF Grants, Project No. 2000-015-DP0077. The work of A.D. and D.L. was financially supported by NSERC of Canada.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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