Recent time-dependent CP asymmetry measurements in the B_d → J/ψ K_S channel by the BaBar and Belle Collaborations yield somewhat lower values of sin 2β 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/ψ K_S channel, thus disturbing the extraction of β. We show that the R-parity-violating interactions in supersymmetric theories can provide extra new phases

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... ch play a role in significantly reducing the above CP asymmetry, thus explaining why BaBar and Belle report lower values of sin 2β. The same couplings also affect the B_d →ϕ K_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.