Bounds from $t\bar{t}$ production on R-parity violating models of supersymmetry

Abstract

We study $t\bar{t}$ production in R-parity violating supersymmetry. The annihilation channel $q\bar{q}\to t\bar{t}$ gets new contributions from $t$-channel exchange of squarks or sleptons. With the data from Tevatron on $t\bar{t}$ production, we find that the squark- or slepton-exchange processes constrain the $B$-violating ${\lambda }^{\prime \prime }$ couplings or the $L$-violating ${\lambda }^{\prime }$ couplings, respectively. Our bounds are already comparable to the few existing constraints on third-generation $R$-parity violating couplings, and will improve when more precise measurements of the $t\bar{t}$ production cross-section become available. We also discuss the effects of these couplings for top production at the LHC.

Comments: 12 pages, Latex, 3 postscript figures