Abstract
Recent time-dependent CP asymmetry measurements in the B d → J / ψK S channel by the BaBar and Belle Collaborations yield somewhat lower values of sin2 β compared to the one obtained from the standard model fit. If the inconsistency between these numbers persists with more statistics, this will signal new physics contaminating the B d → J / ψK S channel, thus disturbing the extraction of β . We show that the R -parity-violating interactions in supersymmetric theories can provide extra new phases which play a role in significantly reducing the above CP asymmetry, thus explaining why BaBar and Belle report lower values of sin2 β . The same couplings also affect the B d → φK S decay rate and asymmetry, explain the B → η ′ K anomaly, and predict nonzero CP asymmetry in dominant B s decays. The scenario will be tested in the ongoing and upcoming B factories.
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