Observation of Massive Muon Pairs in Hadron Collisions

Abstract
Muon pairs in the mass range 1<mμμ<6.7 Gevc2 have been observed in collisions of high-energy protons with uranium nuclei. At an incident energy of 29 GeV, the cross section varies smoothly as dσdmμμ1032mμμ5 cm2 (GeVc)2 and exhibits no resonant structure. The total cross section increases by a factor of 5 as the proton energy rises from 22 to 29.5 GeV.