research

B Physics: CP Violation Beyond the SM

Abstract

We analyse the present experimental evidence for a complex CKM matrix, even allowing for New Physics contributions to ϵK\epsilon_{K}, aJ/ΨKSa_{J/\Psi K_{S}}%, ΔMBd\Delta M_{B_{d}}, ΔMBs\Delta M_{B_{s}}, and the ΔI=1/2\Delta I=1/2 piece of ρρ% B\to \rho \rho and BρπB\to \rho \pi . We emphasize the crucial r\^{o}le played by the angle γ\gamma in both providing irrefutable evidence for a 3×\times 3 complex CKM matrix and placing constraints on the size of NP contributions. It is shown that even if one allows for New Physics a real CKM matrix is excluded at a 99.92% C.L., and the probability for the phase γ\gamma to be in the interval [170;10][10;170][-170^{\circ};-10^{\circ}]\cup \lbrack 10^{\circ};170^{\circ}] is 99.7%. Large value of the phase χ\chi , e.g. of order λ\lambda , is only possible in models where the unitarity of the 3×33\times 3 Cabibbo-Kobayashi-Maskawa matrix is violated through the introduction of extra Q=2/3Q=2/3 quarks. We study the allowed range for χ\chi and the effect of a large χ\chi on various low-energy observables, such as CP asymmetries in BB meson decays. We also discuss the correlated effects which would be observable at high energy colliders, like decays tcZt\to cZ, etc..Comment: 14 pages, 7 figures. Presented at the Symposium in Honour of Gustavo C. Branco "CP Violation and the Flavour Puzzle", Lisbon, Portugal, 19-20 July 2005. To appear in Acta Physica Polonica

    Similar works