Single top-quark production by direct supersymmetric flavor-changing neutral-current interactions at the LHC

Abstract

Production of (electrically neutral) heavy-quark pairs, such as t{\bar c} and {\bar t}c, is extremely suppressed in the SM. In supersymmetric (SUSY) theories, such as the MSSM, the number of these events can be significantly enhanced thanks (mainly) to the FCNC couplings of gluinos. We compute the efficiency of this mechanism for FCNC production of heavy quarks at the LHC. We find that σ(pp\to t\bar{c}+\bar{t}c) can reach 1 pb, and therefore one can expect up to 10^{5} events per 100 fb^{-1} of integrated luminosity (with no counterpart in the SM). Their detection would be instant evidence of new physics, and could be a strong indication of underlying SUSY dynamics.

arXiv comment6 pages, 3 figures. New references and comments added. Invited talk at the 7th International Symposium on Radiative Corrections (RADCOR 2005), Shonan Village, Japan, 2005

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• Impact of FCNC top quark interactions on BR(t -> b W)
• Single top production in a non-minimal supersymmetric model
• Single top or bottom production associated with a scalar in γp collision as a probe of topcolor-assisted technicolor
• Single top production associated with a neutral scalar at LHC in topcolor-assisted technicolor