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.
Bibliographical noteFunding Information:
The work of C.S.K. was supported by Grant No. 2001-042-DO0022 of the KRF. 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
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics