Description
We study quark flavour violation (QFV) in the squark sector of the Minimal
Supersymmetric Standard Model (MSSM). We assume mixing between the second
and the third squark generations, i.e. ~c_{L, R}-~t_{L, R} mixing. We focus
on QFV effects in bosonic squark decays, in particular in the decay into the
lightest Higgs boson h^0 with the mass of ~ 125 GeV, ~u_2 -> ~u_1 h^0, where
~u_{1,2} are the lightest up-type squarks. We show that the branching ratio
of this QFV decay can be quite large (up to ~ 50 %) due to large QFV trilinear
couplings, and large ~c_{R}-~t_{L, R} and ~t_{L}-~t_{R} mixings, despite
the strong constraints on QFV from B meson data. This can result in
remarkable QFV signatures with significant rates at LHC(14 TeV), such as
pp -> gluino gluino X -> t + h^0 + 3 jets + E_T^miss + X and
pp -> gluino gluino X -> t t (or tbar tbar) + h^0 + 2 jets + E_T^miss + X.
The QFV bosonic squark decays can have an influence on the squark and
gluino searches at LHC and can play a role in the determination of the
MSSM parameters, in particular of the QFV trilinear couplings.
(arXiv:1212.4688 [hep-ph])
Primary author
Prof.
Keisho Hidaka
(Tokyo Gakugei University)
Co-authors
Prof.
Alfred Bartl
(University of Wien)
Dr
Bjoern HERRMANN
(LAPP, Annecy)
Dr
Elena Ginina
(University of Wien)
Dr
Helmut EBERL
(IHEP, OEAW, Wien)
Prof.
Walter MAJEROTTO
(IHEP, OEAW, Wien)
Prof.
Werner POROD
(University of Wurzburg)
