Enhanced effects on extracting γ from untagged B0 and Bs decays

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

doi:10.1016/j.physletb.2007.03.057

Enhanced effects on extracting γ from untagged B⁰ and B_s decays

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

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

23 Scopus citations

Abstract

The weak phase γ can be determined using untagged B⁰ → D K_S or B_s → 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 B_s - 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 language	English
Pages (from-to)	61-66
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	649
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2007.03.057
State	Published - 24 May 2007
Externally published	Yes

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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title = "Enhanced effects on extracting γ from untagged B0 and Bs decays",

abstract = "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.",

author = "Michael Gronau and Yuval Grossman and Ze'ev Surujon and Jure Zupan",

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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AU - Gronau, Michael

AU - Grossman, Yuval

AU - Surujon, Ze'ev

AU - Zupan, Jure

N1 - 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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N2 - 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.

AB - 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.

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Enhanced effects on extracting γ from untagged B⁰ and B_s decays

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