A light stop and its consequences at the Tevatron and LEPII

Abstract

An interesting prediction of a string-inspired {\em one-parameter} $SU(5)\times U(1)$ supergravity model, is the fact that the lightest member (${\tilde{t}}_1$) of the top-squark doublet $({\tilde{t}}_1,{\tilde{t}}_2)$, may be substantially lighter than the top quark. This sparticle (${\tilde{t}}_1$) may be readily pair-produced at the Tevatron and, if $m_{{\tilde{t}}_1}\text{lsim}130\text{GeV}$, even be observed at the end of Run IB. Top-squark production may also be an important source of sought-for top-quark signatures in the dilepton and $\ell$+jets channels. Therefore, a re-analysis of the top data sample in the presence of a possibly light top-squark appears necessary before definitive statements concerning the discovery of the top quark can be made. Such a light top-squark is linked with a light supersymmetric spectrum, which can certainly be searched for at the Tevatron through trilepton and squark-gluino searches, and at LEPII through direct ${\tilde{t}}_1$ pair-production (for $m_{{\tilde{t}}_1}\text{lsim}100\text{GeV}$) and via chargino and Higgs-boson searches.

Comments: CERN-TH.7296/94, 9 pages, LaTeX, 3 figures (included as uuencoded file)