Lepton CP Asymmetries in B Decays

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  • 17 March 1997
Abstract
In the decay of Upsilon(4S), the decay time distribution of Upsilon(4S) -> f + X, where f is a final state that both B0 and B0bar can decay to, is the sum of the decay time distributions of B0 -> f and B0bar -> f. Using this general rule, we estimate the sensitivity of single lepton CP violation measurements with respect to that of traditional di-lepton measurements. We find that the sensitivity of the single lepton method is comparable to or better than that of the di-lepton method. The two data samples are largely statistically independent, so that they can be combined to improve sensitivity. The advantage of the single lepton measurement increases for large mixings, which suggests that the single lepton method holds promise for Bs. We also discuss lepton asymmetry measurements on the Z0 peak and in hadron colliders. The achievable sensitivity with the currently available data is already in the range relevant to standard model predictions.

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