Possible Supersymmetry Scenario forpp―Collider Monojet Events and Unaccompanied "Photon" Events

Abstract

Anomalous missing-$p_T$ events observed at the CERN $p\bar{p}$ collider can be plausibly explained by the photino decay mode $\tilde{q}\to q\tilde{\gamma }$ of scalar quarks with mass ∼ 100 GeV. This gives a Jacobian peak in the jet $p_T$ distribution suggested by the data of Arnison et al. Two-photon decays of ${\pi }^0$, $\eta$, ${\eta }^{\prime }$ may account for the "photon" events. To account for the reported rates and to avoid gluino mass limits, the gluino and photino must be light and nearly degenerate.