Search for New Physics in Photon-Lepton Events in Proton-Antiproton Collisions at sqrt(s) = 1.8 TeV

TL;DR

This paper searches for anomalous photon-lepton events in proton-antiproton collisions at 1.8 TeV, finding results mostly consistent with the standard model but noting an excess of events with large missing transverse energy.

Contribution

It provides the first detailed search for photon-lepton events with large missing energy at Tevatron energies, exploring potential signs of new physics beyond the standard model.

Findings

Observed 16 photon-lepton events with large missing energy.

Expected 7.6 ± 0.7 events based on standard model.

Results largely consistent with standard model expectations.

Abstract

We present the results of a search in proton-antiproton collisions at sqrt(s) = 1.8 TeV for anomalous production of events containing a photon with large transverse energy and a lepton (e or mu) with large transverse energy, using 86 pb^{-1} of data collected with the Collider Detector at Fermilab during the 1994-95 collider run at the Fermilab Tevatron. The presence of large missing transverse energy, additional photons, or additional leptons in these events is also analyzed. The results are consistent with standard model expectations, with the possible exception of photon-lepton events with large missing transverse energy, for which the observed total is 16 events and the expected mean total is 7.6+/-0.7 events.