SU(3) relations and the CP asymmetries in B decays to ηKS, ΦKS, and K+K- KS

Yuval Grossman, Zoltan Ligeti, Yosef Nir, Heien Quinn

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139 Scopus citations


We consider CP asymmetries in neutral B meson decays to ηKS, ΦKS, and K+K- KS. We use SU(3) relations to estimate or bound the contributions to these amplitudes proportional to V*ubVus. Such contributions induce a deviation of the Sf terms measured in these time dependent CP asymmetries from that measured for ψKS. For the K +K-KS mode, we estimate the deviation to be of order 0.1. For the η′ KS mode, we obtain an upper bound on this deviation of order 0.3. For the ΦKS mode, we have to add a mild dynamical assumption to the SU(3) analysis due to insufficient available data, yielding an upper bound of order 0.25. These bounds may improve significantly with future data. While they are large at present compared to the usually assumed standard model contribution, they are obtained with minimal assumptions and hence provide more rigorous tests for new physics. If measurements yield |Sf- SΦKK| that are much larger than our bounds, it would make a convincing case for new physics.

Original languageEnglish
Article number015004
JournalPhysical Review D
Issue number1
StatePublished - 2003
Externally publishedYes


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