Determination of 2βsin Bs0→ J/ψK+K−decays in the presence of a K+K−S-wave contribution

2009/08/31 by Yuehong Xie, Peter Clarke, Greig Cowan +2 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1088/1126-6708/2009/09/074

published as JHEP 0909:074,2009 · 11 pages, 6 figures

arxiv created 2009/09/15 · openalex publication_date 2009/09/15 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28

Abstract

We present the complete differential decay rates for the process B_s -> 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 2beta_s. 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 2beta_s towards zero of the order of 10%. When including the K⁺K^- S-wave component we observe an increase in the statistical error on 2beta_s by less than 15%. We also point out the possibility of measuring the sign of cos2beta_s 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.

Citations

• Time-integrated and time-dependent angular analyses ofB→J/ψKπ: A measurement ofcos2βwith no sign ambiguity from strong phases
• Probing new physics through B mixing: Status, benchmarks and prospects

Cited by

• Determination of the Sign of the Decay Width Difference in theBs0System