Search for Squarks and Gluinos in Events Containing Jets and a Large Imbalance in Transverse Energy

TL;DR

This study searches for supersymmetric particles, specifically squarks and gluinos, in proton-antiproton collisions, finding no evidence and setting new mass limits within minimal supergravity models.

Contribution

First search for squarks and gluinos in jets plus missing energy events at the Fermilab Tevatron, establishing new exclusion limits on their masses.

Findings

No significant excess observed beyond standard model expectations.

Excluded squark masses below 250 GeV/c^2 for certain model parameters.

Excluded equal squark and gluino masses below 260 GeV/c^2.

Abstract

Using data corresponding to an integrated luminosity of 79 pb-1, D0 has searched for events containing multiple jets and large missing transverse energy in pbar-p collisions at sqrt(s)=1.8 TeV at the Fermilab Tevatron collider. Observing no significant excess beyond what is expected from the standard model, we set limits on the masses of squarks and gluinos and on the model parameters m_0 and m_1/2, in the framework of the minimal low-energy supergravity models of supersymmetry. For tan(beta) = 2 and A_0 = 0, with mu < 0, we exclude all models with m_squark < 250 GeV/c^2. For models with equal squark and gluino masses, we exclude m < 260 GeV/c^2.