News
Implications of the first evidence of the Bs→μμ decay! [November 12, 2012]
After the
publication of the first measurement of the B
s→μμ branching fraction
by the
LHCb experiment,
we update our frequentist analysis of the parameter space of the CMSSM and NUHM1 models. The following results
are based on a (non-official)
combination of the ATLAS, CDF, CMS, and LHCb results yielding:
BR(B
s→μμ) ≈ 3.0
-1.1+1.2 x 10
-9.
The new measurement provides a valuable new constraint on the supersymmetric parameter space, but
the observation of a Standard Model-like branching fraction for the Bs→μμ decay is quite consistent with supersymmetry.
In fact, a Standard Model-like branching fraction of this decay was expected in constrained supersymmetric models like
the CMSSM or NUHM1 (see, e.g., the
recent MasterCode results for further details).
As a result, the favoured regions in the parameter space of these models do not change significantly after the inclusion of the new constraint.
Read more...
Introduction
The
MasterCode is a computer code that allows to fit GUT based versions of the
Minimal Supersymmetric Standard Model (MSSM) to currently existing
experimental data.
Members of the MasterCode collaboration:
Oliver Buchmüller,
Rick Cavanaugh,
Matthew Citron,
Albert De Roeck,
Matthew Dolan,
John Ellis,
Henning Flächer,
Thomas Hahn,
Sven Heinemeyer,
Gino Isidori,
Jad Marrouche,
Simon Nakach,
Diego Martinez Santos,
Keith Olive,
Sam Rogerson,
Frederic Ronga,
Kees de Vries,
Georg Weiglein
Codes incorporated into the MasterCode:
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