Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-06-08
Mod.Phys.Lett.A10:2289-2296,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
CERN-TH.7296/94, 9 pages, LaTeX, 3 figures (included as uuencoded file)
Scientific paper
10.1142/S0217732395002441
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 $m_{\tilde t_1}\lsim130\GeV$, 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 $m_{\tilde t_1}\lsim100\GeV$) and via chargino and Higgs-boson searches.
Lopez Javier
Nanopoulos Dimitri
Zichichi Antonino
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