Search for R-parity Violating Supersymmetry in the Dielectron Channel

TL;DR

This paper reports a search for R-parity violating supersymmetry in proton-antiproton collisions, finding results consistent with background and setting new mass exclusion limits for squarks and gluinos within specific supersymmetry models.

Contribution

First search for R-parity violating supersymmetry in the dielectron channel at Tevatron, establishing new mass bounds for squarks and gluinos.

Findings

Observed 2 events consistent with background expectations.

Excluded squark masses below 243 GeV/c^2 and gluino masses below 227 GeV/c^2 at 95% CL.

Set combined squark and gluino mass limit at 277 GeV/c^2.

Abstract

We report on a search for R-parity violating supersymmetry in p-pbar collisions at sqrt(s) = 1.8 TeV using the D0 detector at Fermilab. Events with at least two electrons and four or more jets were studied. We observe 2 events in 99 +- 4.4 pb-1 of data, consistent with the expected background of 1.8 +- 0.4 events. This result is interpreted within the framework of minimal low-energy supergravity supersymmetry models. Squarks with mass below 243 GeV/c^2 and gluinos with mass below 227 GeV/c^2 are excluded at the 95% confidence level (C. L.) for A_0=0, mu < 0$, tan beta=2 and a finite value for R-parity violating Yukawa coupling lambda'_1jk (j=1, 2 and k=1, 2, 3). For equal squark and gluino masses, the corresponding mass limit is 277 GeV/c^2.