Eur. Phys. J. C 21, 683-700 (2001)
DOI: 10.1007/s100520100767
Extended minimal flavour violating MSSM and implications for B physics
A. Ali and E. LunghiDeutsches Elektronen Synchrotron, DESY, Notkestrasse 85, 22607 Hamburg, Germany
(Received: 20 May 2001 / Revised version: 5 August 2001 / Published online: 31 August 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )
Abstract
The recently reported measurements of the CP asymmetry
by
the BABAR and BELLE collaborations, obtained from the rate differences
in the decays
etc., and their
charge conjugates, are in good agreement with the standard model (SM)
prediction of the same, resulting from the unitarity of the CKM
matrix. The so-called minimal flavour violating (MFV) supersymmetric
extensions of the standard model, in which the CKM matrix remains the
only flavour changing structure, predict
similar to the
one in the SM. With the anticipated precision in
and
other CP asymmetries at the B factories and hadron colliders, one
hopes to pin down any possible deviation from the SM. We discuss an
extension of the MFV-supersymmetric models which comfortably
accommodates the current measurements of the CP asymmetry
, but differs from the SM and the MFV-supersymmetric models due to
an additional flavour changing structure beyond the CKM matrix. We
suggest specific tests in forthcoming experiments in B physics. In
addition to the CP-asymmetries in B-meson decays, such as
and
, and the mass difference
in the
Bs0 -
system, we emphasize measurements of the
radiative transition
as sensitive probes of the
postulated flavour changing structure. This is quantified in terms of
the ratio
, the isospin violating ratio
, and the CP-asymmetry in the decay rates for
and its charge conjugate. Interestingly, the
CKM-unitarity analysis in the Extended-MFV model also allows
solutions
for the Wolfenstein parameter, as opposed to
the SM and the MFV-supersymmetric models for which only
solutions are now admissible, implying
, where
. Such large values of
are hinted by the
current measurements of the branching ratios for the decays
and
.
© Società Italiana di Fisica, Springer-Verlag 2001