Pentaquark Searches in Electron-Positron Annihilations and Two-Photon Collisions at LEP

TL;DR

This paper reports on searches for pentaquark states in electron-positron and two-photon collisions at LEP, finding no evidence but setting upper limits on their production rates.

Contribution

First comprehensive search for pentaquarks in LEP data, establishing upper limits on their production in electron-positron and two-photon processes.

Findings

No significant pentaquark signals observed.

Upper limits set on pentaquark production rates.

Provides constraints for future exotic hadron searches.

Abstract

Evidence for the production of exotic hadron states composed of five quarks (pentaquarks) has been searched for in data collected by the ALEPH, DELPHI, and L3 experiments at LEP. No significant signal is observed. Several 95% C.L. upper limits are set on the production rates of such particles.