Enhanced effects on extracting γ from untagged B0 and Bs decays

Michael Gronau, Yuval Grossman, Ze'ev Surujon, Jure Zupan

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22 Scopus citations


The weak phase γ can be determined using untagged B0 → D KS or Bs → D φ{symbol}, D η(′) decays. In the past, the small lifetime difference y ≡ Δ Γ / (2 Γ) has been neglected in B0, while the CP-violating parameter ε{lunate} ≡ 1 - | q / p |2 has been neglected in both B0 - over(B, ̄)0 and Bs - over(B, ̄)s mixings. We estimate the effect of neglecting y and ε{lunate}. We find that in D decays to flavor states this introduces a systematic error, which is enhanced by a large ratio of Cabibbo-allowed to doubly Cabibbo-suppressed D-decay amplitudes.

Original languageEnglish
Pages (from-to)61-66
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1
StatePublished - 24 May 2007
Externally publishedYes

Bibliographical note

Funding Information:
This work is supported in part by the Israel Science Foundation under Grants Nos. 378/05 and 1052/04 and by the German–Israeli Foundation under Grant No. I-781-55.14/2003. The work of J.Z. was supported in part by the Slovenian Ministry of Science and Education.


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