Supersymmetric CP Violation in B decays at LHCb Experiment
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Date
2018-03-11
Authors
Journal Title
Journal ISSN
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Shaaban Said Khalil / Benslama Achour
Abstract
One of the most promising signals of new physics at colliders is the rare decay
B ! + . If the observation of B ! + occurs at present experiments,
it would be a clear sign of new physics. In this regards, we calculate this process in
an extended Higgs sector framework where the decay is mediated by the exchange
of spin zero particle with
avour changing neutral current couplings. If we identify
the scalar with the newly discovered state at LHC with a mass 125 GeV then we
nd that, after imposing all experimental constraints, the BR(Bs ! + ) can
be as high 106 and BR(Bd ! + ) can be as high as 107. We also
calculate this process in the minimal supersymmetric standard model and nd the
BR(Bs ! + ) is typically of the order 108.
Also, we study the processes B
! D and B ! D on the light of a deviation
from the standard model expectations which has been recently reported by
BaBar, Belle and LHCb. Since these processes are all tree-level decays in the SM, it
is di cult to explain this deviation with models of new physics. Thus, we show that
supersymmetric e ects driven by penguin contributions to the b ! c transition are
able to account simultaneously for a signi cant increase of both branching ratios of
B
! D and B
! D with respect to the Standard Model predictions, thereby
approaching their experimentally measured values. We emphasis that a degeneracy
between the lightest chargino and neutralino, with masses less than 300 GeV, in addition
to a large stau/snueutrino mass and a large tan are essential for enhancing the
e ect of the lepton penguin W , which is responsible for the improved theoretical
predictions with respect to current data.