Determination of 2betas in Bs -> J/psi K+ K- Decays in the Presence of a K+K- S-Wave Contribution
Abstract
We present the complete differential decay rates for the process Bs -> J/psi K+ K- including S-wave and P-wave angular momentum states for the K+ K- meson pair. We examine the effect of an S-wave component on the determination of the CP violating phase 2betas. Data from the B-factories indicate that an S-wave component of about 10% may be expected in the phi(1020) resonance region. We find that if this contribution is ignored in the analysis it could cause a bias in the measured value of 2betas towards zero of the order of 10%. When including the K+K- S-wave component we observe an increase in the statistical error on 2betas by less than 15%. We also point out the possibility of measuring the sign of cos2betas by using the interference between the K+K- S-wave and P-wave amplitudes to resolve the strong phase ambiguity. We conclude that the S-wave component can be properly taken into account in the analysis.
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