Search for Diphoton Events with Large Missing Transverse Energy in proton-antiproton collisions at sqrt(s) = 1.8 TeV

TL;DR

This study searches for new physics signals in proton-antiproton collisions by analyzing diphoton events with missing transverse energy, setting limits on supersymmetric particle production cross sections.

Contribution

First to analyze diphoton plus missing energy events at 1.8 TeV, establishing new limits on supersymmetric particle production cross sections.

Findings

No excess of events with high missing transverse energy observed.

Set upper limits on production cross sections for selectron, sneutrino, and neutralino pairs.

Established a general limit of 185 fb on diphoton plus missing energy production cross section.

Abstract

A search for signals of new physics has been carried out in the channel p pbar -> gamma gamma + ETmiss. This signature is expected in various recently proposed supersymmetric (SUSY) models. We observe 842 events with two photons having transverse momentum ET(g) > 12 GeV and pseudorapidity |eta(g)| < 1.1. Of these, none have missing transverse energy (ETmiss) in excess of 25 GeV. The distribution of ETmiss is consistent with that of the expected background. We therefore set limits on production cross sections for selectron, sneutrino and neutralino pairs, decaying into photons. The limits range from about 400 fb to 1 pb depending on the sparticle masses. A general limit of 185 fb (95% C.L.) is set on sigma.B(pbar p -> gamma gamma ETmiss + X) where ET(g) > 12 GeV, |eta(g)| < 1.1, and ETmiss > 25 GeV.