Like Sign Top Pair Production at LHC

Abstract

Having a mass comparable to the weak scale, the top quark may have a sizable flavor changing couplings to Higgs bosons. We show that such couplings can be probed at the LHC through the parton subprocess $c(\bar{c})g\to t(\bar{t})A^0$, where the pseudoscalar $A^0$ subsequently decays into $t\bar{c}$ or $\bar{t}c$, giving rise to the intriguing final state of like sign top quark pairs. We also discuss major backgrounds to the above signal, in particular the QCD-Weak process $q{\bar{q}}^{\prime }\to W^{+}(W^{-})t\bar{t}$. The issue of background reduction is briefly discussed.

9 pages, use sprocl.sty and psfig.tex; invited talk presented at the Third International Workshop on Particle Physics Phenomenology, Chinsan, Taipei, Taiwan, Nov. 14-17, 1996; to appear in the proceedings