Possible Scalar-Quark Production of the Proton-Antiproton Collider

Abstract

Single-jet events opposite to an electron track at the proton-antiproton collider may signal the semileptonic decay $\tilde{q}\to e\tilde{\nu }X$ of a heavy scalar quark $\tilde{q}$ with $m_{\tilde{q}}=35\mathrm{}$ GeV. Only an observation of the opposite anti-scalar-quark or gluino jet with its typical missing-energy pattern can distinguish this possibility from the recently suggested top-quark interpretation of the "electron plus single-jet" events. The nonobservation of the hadronic opposite-side jet, for the experimental cut ${E_T}^{\mathrm{jet}}>10\mathrm{}$ GeV, favors a missing-energy signature as expected for supersymmetric particles.