A Search for Dilepton Signatures from Minimal Low-Energy Supergravity in $p\bar{p}$ Collisions at $\sqrt{s}=1.8$ TeV

TL;DR

This paper reports a search for supersymmetry signatures in proton-antiproton collisions at 1.8 TeV using the DØ detector, setting new mass limits on squarks and gluinos under the minimal supergravity model.

Contribution

First search for supersymmetry in $par{p}$ collisions at 1.8 TeV with the DØ detector, establishing new exclusion limits on squark and gluino masses.

Findings

No excess events observed beyond background expectations.

Set a 95% confidence level lower limit of 255 GeV/$c^2$ on squark and gluino masses.

Excluded regions in the $(m_0,m_{1/2})$ parameter space for $ an{eta}=2$--6.

Abstract

We report on a search for supersymmetry using the D\O detector. The 1994-1996 data sample of $\sqrt{s}=1.8$ TeV $p\bar{p}$ collisions was analyzed for events containing two leptons ($e$ or $\mu$), two or more jets, and missing transverse energy. Assuming the minimal supergravity model, with $A_0=0$ and $\mu<0$, various thresholds were employed to optimize the search. No events were found beyond expectation from background. We set a lower limit at the 95% C.L. of 255 GeV/$c^2$ for equal mass squarks and gluinos for $\tan{\beta}=2$, and present exclusion contours in the $(m_0,m_{1/2})$ plane for $\tan{\beta}=2$--6.