Inclusive production of direct photons in 200-GeV/c collisions

  • M. McLaughlin
  • , J. Biel
  • , C. Bromberg
  • , B. Brown
  • , C. Chandlee
  • , S. Cihangir
  • , S. R.W. Cooper
  • , T. Ferbel
  • , D. Garelick
  • , G. Glass
  • , M. Glaubman
  • , S. R. Han
  • , K. Heller
  • , S. Hossain
  • , J. Huston
  • , A. Jonckheere
  • , J. Lebritton
  • , R. A. Lewis
  • , F. Lobkowicz
  • , M. Marshak
  • C. A. Nelson, E. Peterson, E. Pothier, J. Povlis, K. Ruddick, M. Shupe, P. Slattery, G. A. Smith

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42 Scopus citations

Abstract

The authors have measured the inclusive production of direct photons in the transverse momentum (pT) range 2.1-5.0 GeV/c in 200-GeV/c collisions of protons and π+ mesons on a carbon target. A significant yield of direct photons was observed for pT>2.5 GeV/c. The invariant cross section for direct-photon production, when compared with measurements from the CERN intersecting storage rings, can be expressed in terms of pT and xT=2pTsas(42±14)(1-xT)8. 1±1.0pT-6.6±0.3 μb/GeV2 for the c.m. energy range from s=19.4 to 63 GeV, and for the xT range from 0.2 to 0.5.

Original languageEnglish (US)
Pages (from-to)971-974
Number of pages4
JournalPhysical review letters
Volume51
Issue number11
DOIs
StatePublished - 1983

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