Correlations among new CP violating effects in Delta F = 2 observables
| dc.creator | Buras, Andrzej J. | |
| dc.creator | Guadagnoli, Diego | |
| dc.date | 2008-05-26 | |
| dc.date | 2008-06-06 | |
| dc.date.accessioned | 2026-07-07T11:51:06Z | |
| dc.date.available | 2026-07-07T11:51:06Z | |
| dc.description | We point out that the observed CP violation in Bd - bar{Bd} mixing, taking into account the measured ratio Delta Md / Delta Ms, the recently improved lattice value of the non-perturbative parameter BK and an additional effective suppression factor kappa_epsilon ~= 0.92 in epsilon_K neglected sofar in most analyses, may be insufficient to describe the measured value of epsilon_K within the Standard Model (SM), thus hinting at new CP violating contributions to the K - bar{K} and/or Bd - bar{Bd} systems. Furthermore, assuming that Delta Md / Delta Ms is SM-like, the signs and the magnitudes of new physics effects in epsilon_K and in the CP asymmetries S_{psi Ks} and S_{psi phi} 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 degrees could remove the tension between epsilon_K and S_{psi Ks} present in the SM and simultaneously accommodate, at least partly, the recent claim of S_{psi phi} being much larger than the SM expectation. We emphasize the importance of precise determinations of Vcb, BK, FK and xi_s, to which the parameter epsilon_K and its correlation with the CP violation in the Bd - bar{Bd} system are very sensitive. | |
| dc.description | 8 pages, 5 figures, 2 tables. v2: additional negative correction to epsilon_K included, other input updated, numerics slightly changed. Conclusions unchanged. References added | |
| dc.identifier | https://arxiv.org/abs/0805.3887 | |
| dc.identifier | http://arxiv.org/abs/0805.3887 | |
| dc.identifier | Phys.Rev.D78:033005,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.78.033005 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/203782 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Correlations among new CP violating effects in Delta F = 2 observables | |
| dc.type | text |