Flavour violating bosonic squark decays at LHC

K. Hidaka , A. Bartl , H. Eberl , E. Ginina , B. Herrmann (1) , W. Majerotto , W. Porod (2)

1 LAPTH - Laboratoire d'Annecy-le-Vieux de Physique Théorique
2 Institut für Theoretische Physik und Astronomie [Würzburg]

Quark flavour conserving (QFC) fermionic squark decays, such as ~t_{1,2} -> t neutralino_i, are usually assumed in squark search analyses. Here we study quark flavour violating (QFV) bosonic squark decays, such as ~u_2 -> ~u_1 h^0/Z^0, where the mass eigenstates ~u_{1,2} are mixtures of scharm and stop quarks. We show that the branching ratios of such QFV decays can be very large due to sizable ~c_R - ~t_{R/L} and ~t_R - ~t_L mixing effects despite the very strong constraints on the QFV parameters 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 c bar{c} bar{c} h^0/Z^0 missing-E_T X and pp -> gluino gluino X -> t t bar{c} bar{c} h^0/Z^0 missing-E_T X. The QFV bosonic squark decays can play an important role in the squark and gluino searches at LHC (14 TeV).

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Phénoménologie [hep-ph]

K. Hidaka, A. Bartl, H. Eberl, E. Ginina, B. Herrmann, et al.. Flavour violating bosonic squark decays at LHC. 2013. ⟨hal-00979039⟩