Search for the lightest scalar top quark in events with two leptons in $p arp$ collisions at $sqrts$ = 1.96- TeV

Abstract

Data collected by the D0 detector at a p-pbar center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider have been used to search for pair production of the lightest supersymmetric partner of the top quark decaying into $b ell tilde{nu}$. The search is performed in the $ellell_s14 = emu$ and $mu mu$ final states. No evidence for this process has been found in data samples of approximately 400 pb^-1. The domain in the [$M(tilde{t}_1),M(tilde{nu})$] plane excluded at the 95% C.L. is substantially extended by this search.