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Intermediate-Mass Dilepton Production in Heavy-Ion Collisions at 200AGeV

G. Q. Li and C. Gale*

  • Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794

  • *Permanent address: Physics Department, McGill University, Montreal, QC, H3A 2T8, Canada.
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Phys. Rev. Lett. 81, 1572 – Published 24 August, 1998

DOI: https://doi.org/10.1103/PhysRevLett.81.1572

Abstract

Through the analysis of HELIOS-3 data obtained at the CERN Super Proton Synchrotron (SPS), we demonstrate the importance of secondary processes for dilepton production in heavy-ion collisions in the intermediate invariant mass region. We find that while the dilepton spectra between 1 and 2.5 GeV from proton-induced reactions can be attributed to the decay of primary vector mesons, charmed hadrons, and initial Drell-Yan processes, the strong enhancement seen in the heavy-ion data comes mainly from secondary processes. Furthermore, we find πa1→ll¯ to be the most important process in this mass region, as was found by thermal rate calculations.

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Phys. Rev. Lett. 81, 1572– Published 24 August, 1998
  • Received 30 January 1998

© 1998 American Physical Society

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