Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-15
Phys. Rev. D 79, 074024 (2009)
Physics
High Energy Physics
High Energy Physics - Phenomenology
To be published in Physical Review D; 7 pages, 5 figures, v2-3 fixed typo's; response to reviewers
Scientific paper
10.1103/PhysRevD.79.074024
Heavy, as yet undiscovered particles, can affect measurements of CP violation in the B system. Measuring CP violation in the Bs system provides an excellent place to observe such effects since Standard Model sources are predicted to produce very small effects. The angle -2beta_s, the "phase of Bs-\bar{B}s mixing," thought to be best measured in Bs -> J/psi\phi decays is of order -0.04, while the CP violating asymmetry in Bs -> \phi\phi is predicted to be zero, due to the cancellation of the mixing phase with the decay phase. Recent measurements of \beta_s in J/psi\phi, while not definitive, are much larger than the Standard Model predictions. Measurements in the B^o and Ds+ systems of analogous modes point toward a 5-10% contamination of S-wave K+K- under the \phi peak. This S-wave was not taken into account in these recent analyses. Furthermore this S-wave can also materialize as a f0(980) meson that decays to \pi+\pi-, making the final state J/psi f0 useful for measuring \beta_s with the added advantage of not requiring an angular analysis. Rate estimates, while not precise, predict four to five times fewer such events than those in the J/psi\phi mode. The error on \beta_s, however, may be similar. We also remark on S-wave problems with the Bs -> \phi\phi mode, and possible systematic checks using Bs -> \phi f0.
Stone Sheldon
Zhang Liming
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