Profiles of the unitarity triangle and CP-violating phases in the standard model and supersymmetric theories

Ali, Ahmed; London, David

doi:10.1007/s100529900098

Report/Journal Article

PUBDB-2017-10234

Profiles of the unitarity triangle and CP-violating phases in the standard model and supersymmetric theories

Ali, A.DESY* ; London, D.

1999
Springer Berlin

The European physical journal / C 9(4), 687 - 703 (1999) [10.1007/s100529900098]

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Please use a persistent id in citations: doi:10.1007/s100529900098

Report No.: DESY-99-042; UDEM-GPP-TH-99-58; hep-ph/9903535

Abstract: We report on a comparative study of the profile of the CKM unitarity triangle, and the resulting CP asymmetries in B decays, in the standard model and in several variants of the minimal supersymmetric standard model (MSSM), characterized by a single phase in the quark flavour mixing matrix. The supersymmetric contributions to the mass differences \Delta M_d, \Delta M_s and to the CP-violating quantity |\epsilon| are, to an excellent approximation, equal to each other in these theories, allowing for a particularly simple way of implementing the resulting constraints on the elements of V_{CKM} from the present knowledge of these quantities. Incorporating the next-to-leading-order corrections and applying the current direct and indirect constraints on the supersymmetric parameters, we find that the predicted ranges of \sin 2 \beta in the standard model and in MSSM models are very similar. However, precise measurements at B-factories and hadron machines may be able to distinguish these theories in terms of the other two CP-violating phases \alpha and \gamma. This is illustrated for some representative values of the supersymmetric contributions in \Delta M_d, \Delta M_s and |\epsilon|.

Keyword(s): gauge field theory: SU(3) x SU(2) x U(1) ; supersymmetry: model ; CP: violation ; CKM matrix: unitarity ; quantum chromodynamics: correction ; perturbation theory: higher-order ; K0 anti-K0: mixing ; B0 anti-B0: mixing ; B/s0 anti-B/s0: interference ; mass difference ; violation: flavor ; supergravity ; numerical calculations: interpretation of experiments ; bibliography