Title:  Search for Scalar Top Quark Production in pbarp Collisions at sqrt{s}= 1.8 TeV
Link to paper if available: 
Session of First Preference: Beyond the Standard Model 
Session of Second Preference: 

LP Session: EW physics and beyond II 

Abstract:

A new search by the D0 Collaboration for stop quark pair production in
the inclusive electron-muon-missing E_T final state is done on a
sample of pbarp events corresponding to 108.3 pb-1 of Run I data. The
search is performed assuming that either the scalar neutrino or the
lightest neutralino is the LSP. For the dominant 3-body decay stop ->
b l sneutrino, this analysis provides significantly more stringent
limits as a function of stop and sneutrino mass than previous LEP and
CDF limits. The excluded region extends up to a scalar top mass of 140
GeV (95% CL) for a sneutrino mass of 43 GeV. Assuming that the
lightest neutralino is the LSP, the 4-body decay stop -> b
neutralino_1 f f' may dominate over the 2-body stop -> c neutralino_1
decay if the stop mass is greater than about 100 GeV. Cross-section
limits assuming the 4-body decay stop -> b neutralino l neutrino are
presented for when the decay is mediated by 1) a chargino and a W, and
2) a chargino and a sneutrino.

Submitted:  10 April 2001