Difficulties in obtaining weak phases from b → d penguin decays

Alakabha Datta; David London; C. S. Kim

doi:10.1142/S0217732302008253

Difficulties in obtaining weak phases from b → d penguin decays

Alakabha Datta, David London, C. S. Kim

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We re-examine a recent proposal for obtaining β using the measurements of the b → d penguin decays B_d⁰(t) → K⁰K⁰ and B_s⁰(t) → ΠK_S, 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 language	English
Pages (from-to)	1753-1766
Number of pages	14
Journal	Modern Physics Letters A
Volume	17
Issue number	27
DOIs	https://doi.org/10.1142/S0217732302008253
Publication status	Published - 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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title = "Difficulties in obtaining weak phases from b → d penguin decays",

abstract = "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.",

author = "Alakabha Datta and David London and Kim, {C. S.}",

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.",

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AB - 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.

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