Search for scalar top quarks in the acoplanar charm jets and missing transverse energy final state in $p arp$ collisions at $sqrts$ = 1.96-TeV

Abstract

We present a search for the pair production of scalar top quarks, $tilde{t}$, using 995 pb$^{-1}$ of data collected in $pbar{p}$ collisions with the D0 detector at the Fermilab Tevatron Collider at $sqrt{s} = 1.96$ TeV. Both scalar top quarks are assumed to decay into a charm quark and a neutralino ($tilde{chi}^{0}_{1}$), where $tilde{chi}^{0}_{1}$ is the lightest supersymmetric particle. This leads to a final state with two acoplanar charm jets and missing transverse energy. We find the yield of such events to be consistent with the standard model expectation, and exclude sets of $tilde{t}$ and $tilde{chi}^{0}_{1} $ masses at the 95% C.L. that substantially extend the domain excluded by previous searches.