Eur. Phys. J. C 18, 665-672
DOI: 10.1007/s100520100582
What if the mass difference
is
around 18 inverse picoseconds?
A. Ali1 and D. London2
1 Deutsches Elektronen Synchrotron DESY, 22603 Hamburg, Germany
2 Laboratoire René J.-A. Lévesque, Université de Montréal, C.P. 6128, succ. centre-ville, Montréal, QC, H3C 3J7 Canada
(Received: 14 December 2000 / Published online: 23 January 2001 -© Springer-Verlag 2001)
Abstract
Present experiments in pursuit of the mass
difference in the Bs0-
system have put a lower
bound on this quantity of
(at
95% C.L.). The same experiments also yield a local minimum in the
log-likelihood function around
,
which is 
away from being zero. Motivated by these
observations, we investigate the consequences of a possible
measurement of
, in the
context of both the standard model and supersymmetric models with
minimal flavor violation. We perform a fit of the quark mixing
parameters in these theories and estimate the expected ranges of the
CP asymmetries in B decays, characterized by 
, 
and
, the interior angles of the CKM-unitarity triangle. Based
on this study, we argue that, if indeed
turns out to be
in its currently-favored range, this would disfavor a large class of
supersymmetric models. Indeed, of all the models examined here, the
best fit to the data occurs for the standard model.
© Società Italiana di Fisica, Springer-Verlag 2001
