Profiles of the unitarity triangle and CP-violating phases in the standard model and supersymmetric theories
A. Ali - D. London
Deutsches Elektronen Synchrotron DESY, Hamburg, Germany - Laboratoire René J.-A. Lévesque, Université de Montréal, C.P. 6128, succ. centre-ville, Montréal, QC, H3C 3J7, Canada
Received: 7 April 1999 / Published online: 30 June 1999
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 , and to the CP-violating quantity 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 VCKM 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 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 and . This is illustrated for some representative values of the supersymmetric contributions in , and .