Abstract
An examination of experimental data bearing on the production of muon pairs in nucleon-nucleon interactions demonstrates the existence of a large continuum for pairs with invariant masses less than 1.0 GeV/. The ratio of the pairs to the production of pions, , is of the order of 5 × in the fragmentation region. The production of the pairs obeys Feynman scaling in the fragmentation region; the cross sections are nearly the same for the interactions of 28-GeV protons and 150-GeV protons and the assumption of scaling is consistent with less detailed measurements at 400 GeV over a region of Feynman such that and for values of the invariant mass GeV/. The invariant-mass spectrum of this continuum varies with ; the mean mass changes from about 450 MeV/ at to about 700 MeV/ for . The dimuon production varies with the target nucleus as in an region where meson production varies as . The production is discussed in terms of parton bremsstrahlung, the annihilation of parton pairs produced by the hadron interaction (the Bjorken-Weisberg process) and line broadening of -meson production.
- Received 12 June 1978
DOI:https://doi.org/10.1103/PhysRevD.18.3150
©1978 American Physical Society