[SLAC] [SLAC Pubs and Reports]

SLAC-PUB-7351
CP Asymmetries in B Decays with New Physics in Decay Amplitudes

Abstract

We make a systematic analysis of the effects of new physics in the $B$ decay amplitudes on the $CP$ asymmetries in neutral $B$ decays. Although these are expected to be smaller than new physics effects on the mixing amplitude, they are easier to probe in some cases. The effects of new contributions to the mixing amplitude are felt universally across all decay modes, whereas the effects of new decay amplitudes could vary from mode to mode. In particular the prediction that the $CP$ asymmetries in the $B_d$ decay modes with $b\to c\bar c s$, $b \to c\bar c d$, $ b\to c \bar u d$ and $ b\to s \bar s s$ should all measure the same quantity ($\sin2\beta$ in the \sm) could be violated. Since the above \sm\ prediction is very precise, new decay amplitudes which are a few percent of the \sm\ amplitudes can be probed. Three examples of models where measurable effects are allowed are given: effective supersymmetry, models with enhanced chromomagnetic dipole operators, and supersymmetry without $R$ parity.

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