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

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

Research output: Contribution to journalArticle

45 Citations (Scopus)


We estimate the decay width difference ΔΓdd 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 ΔΓdd, 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 ΔΓdd 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 ΔΓdd in the presence of new physics, and point out some differences in the phenomenology of width differences in the Bs and Bd systems.

Original languageEnglish
Pages (from-to)377-404
Number of pages28
JournalNuclear Physics B
Issue number1-2
Publication statusPublished - 2002 Mar 4

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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