Search for Squarks and Gluinos in Single-Photon Events with Jets and Large Missing Transverse Energy in ppbar Collisions at SQRT(S)=1.8 TeV

TL;DR

This study searches for supersymmetric particles in proton-antiproton collisions by analyzing events with photons, jets, and missing energy, setting new mass limits for squarks and gluinos.

Contribution

First search for squarks and gluinos in single-photon plus jets events at Tevatron, establishing new lower mass limits under specific SUSY model assumptions.

Findings

No excess events observed beyond background expectations.

Set a 95% CL lower mass limit of 310 GeV for squarks and gluinos.

Assumed branching fraction and mass difference conditions in the analysis.

Abstract

We search for physics beyond the standard model using events with a photon, two or more hadronic jets, and an apparent imbalance in transverse energy, in $p\bar{p}$ collisions at the Fermilab Tevatron at $\sqrt{s}=1.8$ TeV. Such events are predicted for production of supersymmetric particles. No excess is observed beyond expected background. For the parameter space of the minimal supersymmetric standard model with branching fraction $B(\tilde\chi^0_2 \to \gamma\tilde\chi^0_1) = 1$ and $m_{\tilde\chi^0_2}-m_{\tilde\chi^0_1}>20$ GeV, we obtain a 95% confidence level lower limit of 310 GeV for the masses of squarks and gluinos, where their masses are assumed equal.