Measurement of the lifetime difference of Bd mesons: Possible and worthwhile?

A. S. Dighe; T. Hurth; C. S. Kim; T. Yoshikawa

doi:10.1016/S0550-3213(01)00655-1

Measurement of the lifetime difference of B_d mesons: Possible and worthwhile?

A. S. Dighe, T. Hurth, C. S. Kim, T. Yoshikawa

Department of Physics

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

52 Citations (Scopus)

Abstract

We estimate the decay width difference ΔΓ_d/Γ_d in the B_d system including 1/m_b contributions and part of the next-to-leading order QCD corrections, and find it to be around 0.3%. We explicitly show that the time measurements of an untagged B_d decaying to a single final state isotropically can only be sensitive to quadratic terms in ΔΓ_d/Γ_d, and hence the use of at least two different final states is desired. We discuss such pairs of candidate decay channels for the final states and explore the feasibility of a ΔΓ_d/Γ_d measurement through them. The measurement of ΔΓ_d would be essential for an accurate measurement of sin(2β) at the LHC. The nonzero width difference can also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the B_d-B̄_d mixing phase. We also derive an upper bound on the value of ΔΓ_d/Γ_d in the presence of new physics, and point out some differences in the phenomenology of width differences in the B_s and B_d systems.

Original language	English
Pages (from-to)	377-404
Number of pages	28
Journal	Nuclear Physics B
Volume	624
Issue number	1-2
DOIs	https://doi.org/10.1016/S0550-3213(01)00655-1
Publication status	Published - 2002 Mar 4

Bibliographical note

Funding Information:
We would like to thank G. Buchalla for many useful discussions and for a reading of the manuscript. We also thank U. Nierste for critical comments, and C. Shepherd-Thermistocleous, Y. Wah and H. Yamamoto for useful discussions concerning the experimental aspects. A.D. would like to thank the CERN Theory Division, where a large fraction of this work was completed. The work of C.S.K. was supported in part by CHEP-SRC Program, Grant No. 20015-111-02-2 and Grant No. R03-2001-00010 of the KOSEF, in part by BK21 Program and Grant No. 2001-042-D00022 of the KRF, and in part by Yonsei Research Fund, Project No. 2001-1-0057. The work of T.Y. was supported in part by the US Department of Energy under Grant No. DE-FG02-97ER-41036.

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

Access to Document

10.1016/S0550-3213(01)00655-1

Cite this

@article{d47eb15fa1424778a74f04dd1a915286,

title = "Measurement of the lifetime difference of Bd mesons: Possible and worthwhile?",

abstract = "We estimate the decay width difference ΔΓd/Γd in the Bd system including 1/mb contributions and part of the next-to-leading order QCD corrections, and find it to be around 0.3%. We explicitly show that the time measurements of an untagged Bd decaying to a single final state isotropically can only be sensitive to quadratic terms in ΔΓd/Γd, and hence the use of at least two different final states is desired. We discuss such pairs of candidate decay channels for the final states and explore the feasibility of a ΔΓd/Γd measurement through them. The measurement of ΔΓd would be essential for an accurate measurement of sin(2β) at the LHC. The nonzero width difference can also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the Bd-{\=B}d mixing phase. We also derive an upper bound on the value of ΔΓd/Γd in the presence of new physics, and point out some differences in the phenomenology of width differences in the Bs and Bd systems.",

author = "Dighe, {A. S.} and T. Hurth and Kim, {C. S.} and T. Yoshikawa",

note = "Funding Information: We would like to thank G. Buchalla for many useful discussions and for a reading of the manuscript. We also thank U. Nierste for critical comments, and C. Shepherd-Thermistocleous, Y. Wah and H. Yamamoto for useful discussions concerning the experimental aspects. A.D. would like to thank the CERN Theory Division, where a large fraction of this work was completed. The work of C.S.K. was supported in part by CHEP-SRC Program, Grant No. 20015-111-02-2 and Grant No. R03-2001-00010 of the KOSEF, in part by BK21 Program and Grant No. 2001-042-D00022 of the KRF, and in part by Yonsei Research Fund, Project No. 2001-1-0057. The work of T.Y. was supported in part by the US Department of Energy under Grant No. DE-FG02-97ER-41036.",

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doi = "10.1016/S0550-3213(01)00655-1",

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T2 - Possible and worthwhile?

AU - Dighe, A. S.

AU - Hurth, T.

AU - Kim, C. S.

AU - Yoshikawa, T.

N1 - Funding Information: We would like to thank G. Buchalla for many useful discussions and for a reading of the manuscript. We also thank U. Nierste for critical comments, and C. Shepherd-Thermistocleous, Y. Wah and H. Yamamoto for useful discussions concerning the experimental aspects. A.D. would like to thank the CERN Theory Division, where a large fraction of this work was completed. The work of C.S.K. was supported in part by CHEP-SRC Program, Grant No. 20015-111-02-2 and Grant No. R03-2001-00010 of the KOSEF, in part by BK21 Program and Grant No. 2001-042-D00022 of the KRF, and in part by Yonsei Research Fund, Project No. 2001-1-0057. The work of T.Y. was supported in part by the US Department of Energy under Grant No. DE-FG02-97ER-41036.

PY - 2002/3/4

Y1 - 2002/3/4

N2 - We estimate the decay width difference ΔΓd/Γd in the Bd system including 1/mb contributions and part of the next-to-leading order QCD corrections, and find it to be around 0.3%. We explicitly show that the time measurements of an untagged Bd decaying to a single final state isotropically can only be sensitive to quadratic terms in ΔΓd/Γd, and hence the use of at least two different final states is desired. We discuss such pairs of candidate decay channels for the final states and explore the feasibility of a ΔΓd/Γd measurement through them. The measurement of ΔΓd would be essential for an accurate measurement of sin(2β) at the LHC. The nonzero width difference can also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the Bd-B̄d mixing phase. We also derive an upper bound on the value of ΔΓd/Γd in the presence of new physics, and point out some differences in the phenomenology of width differences in the Bs and Bd systems.

AB - We estimate the decay width difference ΔΓd/Γd in the Bd system including 1/mb contributions and part of the next-to-leading order QCD corrections, and find it to be around 0.3%. We explicitly show that the time measurements of an untagged Bd decaying to a single final state isotropically can only be sensitive to quadratic terms in ΔΓd/Γd, and hence the use of at least two different final states is desired. We discuss such pairs of candidate decay channels for the final states and explore the feasibility of a ΔΓd/Γd measurement through them. The measurement of ΔΓd would be essential for an accurate measurement of sin(2β) at the LHC. The nonzero width difference can also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the Bd-B̄d mixing phase. We also derive an upper bound on the value of ΔΓd/Γd in the presence of new physics, and point out some differences in the phenomenology of width differences in the Bs and Bd systems.

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