DOI 10.1007/s100529900098
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
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 ,
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
.
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