Correlations among new CP violating effects in ΔF=2 observables
Abstract
We point out that the observed CP violation in Bd- Bmacr d mixing, taking into account the measured ratio ΔMd/ΔMs, the recently decreased lattice value of the nonperturbative parameter B^K and an additional effective suppression factor κγ≃0.92 in γK neglected so far in most analyses, may be insufficient to describe the measured value of γK within the standard model (SM), thus hinting at new CP violating contributions to the K- Kmacr and/or Bd- Bmacr d systems. Furthermore, assuming that ΔMd/ΔMs is SM-like, the signs and the magnitudes of new-physics effects in γK and in the CP asymmetries SψKs and Sψϕ may turn out to be correlated. For example, in a scenario with new CP phases in Bd and Bs mixings being approximately equal and negative, a common new phase ≈-5° could remove the tension between γK and SψKs present in the SM and simultaneously accommodate, at least partly, the recent claim of Sψϕ being much larger than the SM expectation. We emphasize the importance of precise determinations of Vcb, B^K, FK, and ξs, to which the parameter γK and its correlation with the CP violation in the Bd- Bmacr d system are very sensitive.
- Publication:
-
Physical Review D
- Pub Date:
- August 2008
- DOI:
- 10.1103/PhysRevD.78.033005
- arXiv:
- arXiv:0805.3887
- Bibcode:
- 2008PhRvD..78c3005B
- Keywords:
-
- 12.15.Ji;
- 14.40.Aq;
- 14.40.Nd;
- Applications of electroweak models to specific processes;
- pi K and eta mesons;
- Bottom mesons;
- High Energy Physics - Phenomenology
- E-Print:
- 8 pages, 5 figures, 2 tables. v2: additional negative correction to epsilon_K included, other input updated, numerics slightly changed. Conclusions unchanged. References added