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.

Funding

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.

Funders	Funder number
German–Israeli Foundation	I-781-55.14/2003
Israel Science Foundation	378/05, 1052/04
Ministrstvo za Izobraževanje, Znanost in Šport

Access to Document

10.1016/j.physletb.2007.03.057

Cite this

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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.

PY - 2007/5/24

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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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