Measurement of the width difference of Bd mesons

T. Hurth, C.S. Kim, A.S. Dighe, T. Yoshikawa
We estimate ΔΓd/Γd, including 1/mb contributions and part of the next-to-leading order QCD corrections, and find it to be around 0.3%. We show the methods to measure ΔΓd/Γd by using at least two different final states on the untagged Bd decay. The nonzero width difference can also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the Bd − Bd mixing phase. With the high statistics and accurate time resolution of the upcoming LHC experiment, the measurement of
more » ... ΔΓd seems to be possible. This measurement would be important for an accurate measurement of sin 2ϕ1 at the LHC. We also derive an upper bound on the value of ΔΓd/Γd in the presence of new physics.
doi:10.17615/rm0c-5f32 fatcat:aoz4ixxnbjctfagwi6moruogbq