Dimuon production cross sections have been measured with a 200 GeV π− beam and a 240 GeV proton (p) beam. The dimuon mass spectra produced by π and p have essentially the same shape. The dimuon transverse momentum behavior is essentially the same for vector mesons produced by π or by p. For (ρ+ω) or ψ production the x (Feynman) behavior is approximately independent of the mass of the dimuon produced. The dimuon π production cross section is approximately 6 times greater than that of the p for x≳5.
Using a missing mass (Mm) technique, the same pion and proton beams were used to search for the production in hydrogen of new particles which decay with muon emission. Model dependent upper limits (50 to 7000 nanobarns) for the production of such objects with 2.5<Mm<7. GeV are given (for charmed meson pair production Mm is the amss of the DD̄ system).
