R-parity violating effects in top quark FCNC productions at LHC

Abstract

In the minimal supersymmetric model the R-parity violating top quark interactions, which are so far weakly constrained, can induce various flavor-changing neutral-current (FCNC) productions for the top quark at the Large Hadron Collider (LHC). In this work we assume the presence of the B-violating couplings and examine their contributions to the FCNC productions proceeding through the parton processes cg -> t, gg -> t c_bar, cg -> tγ, cg -> t Z and cg -> t h. We find that all these processes can be greatly enhanced relative to the R-parity preserving predictions. In the parameter space allowed by current experiments, all the production channels except cg ->t h can reach the 3-sigma sensitivity, in contrast to the R-parity preserving case in which only cg -> t can reach the 3-sigma sensitivity.

version in PRD (discussions added)

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• Searches for the FCNC couplings from top-Higgs associated production signal with $h\to \gamma \gamma$ at the LHC
• Top quark three-body decays in the R-parity violating MSSM
• Probing the Top Quark Flavour-Changing Neutral Current at a Future Electron-Positron Collider
• Top quark decay t -> cb\bar{b} in topcolor-assisted technicolor models
• Single top or bottom production associated with a scalar in γp collision as a probe of topcolor-assisted technicolor
• Machine Learning Approaches to Top Quark Flavor-Changing Four-Fermion Interactions in Trilepton Signals at the LHC
• Single slepton production associated with a top quark at LHC in NLO QCD