Study of final states inπ−N→μ+μ−+hadrons at 225 GeV

An investigation is made of the final-state hadrons produced in association with muons by a 225-GeV ${\pi }^{-}$ beam interacting with a Lucite target. It is found that the hadrons produced in association with muon pairs do not differ significantly from hadrons produced in any other inelastic interaction. Cross sections for $\frac{\psi }{J}$ production in Lucite and Pb and upper limits for charmed-particle production are obtained. A comparison is made with models of $\frac{\psi }{J}$ production.