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 Sep 7

Bibliographical note

Funding Information:
C.S.K. thanks D.L. for the hospitality of the Universite de Montreal, where some of this work was done. The work of C.S.K. was supported in part by the KRF Grants, Project No. 2000-015-DP0077. The work of A.D. and D.L. was nancially supported by NSERC of Canada.

All Science Journal Classification (ASJC) codes

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


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