Difficulties in obtaining weak phases from b → d penguin decays

Alakabha Datta, David London, C. S. Kim

Research output: Contribution to journalArticlepeer-review


We re-examine a recent proposal for obtaining β using the measurements of the b → d penguin decays Bd0(t) → K0K0 and Bs0(t) → ΠKS, along with a theoretical assumption. We show that there are in fact three assumptions one can make, so that the method can in principle be used to extract α, β or γ. We also show that the best assumption is the one which yields γ. However, the theoretical error on this assumption is still 25-30%, which leads to an error on → of at least 20-25%. Given our current understanding of hadronic physics, it does not seem possible to reduce this error.

Original languageEnglish
Pages (from-to)1753-1766
Number of pages14
JournalModern Physics Letters A
Issue number27
Publication statusPublished - 2002 Sept 7

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics
  • Physics and Astronomy(all)


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