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

TL;DR

This paper investigates how R-parity violating interactions in supersymmetry can significantly enhance top quark flavor-changing neutral-current production processes at the LHC, potentially observable with current experimental constraints.

Contribution

It analyzes the impact of B-violating R-parity violating couplings on top FCNC productions, highlighting their potential observability at the LHC beyond R-parity conserving predictions.

Findings

All studied processes can be greatly enhanced compared to R-parity conserving cases.

Most channels, except cg -> t h, can reach 3-sigma sensitivity within current experimental bounds.

Enhanced production rates could allow detection of R-parity violating effects at the 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 -> t\gamma, 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.