Abstract
We estimate ΔΓ d /Γ d , including 1/ m b 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 ΔΓ d /Γ d by using at least two different final states on the untagged B d decay. The nonzero width difference can also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the B d — B d mixing phase. With the high statistics and accurate time resolution of the upcoming LHC experiment, the measurement of ΔΓ d seems to be possible. This measurement would be important for an accurate measurement of sin 2φ 1 at the LHC. We also derive an upper bound on the value of ΔΓ d /Γ d in the presence of new physics.
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