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 - B̄d mixing phase. With the high statistics and accurate time resolution of the upcoming LHC experiment, the measurement of 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.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics