Direct photon cross sections in proton-proton and antiproton-proton interactions at √s = 24.3 GeV

G. Ballocchi, R. E. Breedon, L. Camilleri, C. Comtat, R. L. Cool, P. T. Cox, Priscilla B Cushman, L. Dick, E. C. Dukes, P. Giacomelli, D. B. Hubbard, J. B. Jeanneret, C. Joseph, W. Kubischta, C. Morel, M. C. Nguyen, P. Oberson, O. E. Overseth, J. L. Pagès, J. P. PerroudD. Rüegger, Roger W Rusack, V. M. Singh, G. R. Snow, G. Sozzi, L. Studer, M. T. Tran, A. Vacchi, G. Valenti, M. Werlen

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


We report results on inclusive direct photon (γ),π0, and η production in both pp and p̄p interactions at √s = 24.3 GeV in the transverse momentum range 4.1 ≤ pT ≤ GeV/c and rapidity range -0.1 ≤ y ≤ 0.9. The data were collected between 1988 and 1990 by the UA6 experiment at CERN, which employed an internal H2 gas jet target in the Sp̄pS collider. The inclusive direct photon cross sections and the cross section difference σ(p̄p) - σ(pp) expressed as functions of PT(y) are compared with next-to-leading order QCD predictions.

Original languageEnglish (US)
Pages (from-to)222-230
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - Sep 17 1998

Bibliographical note

Funding Information:
We wish to thank the CERN PS and SPS Divisions for their magnificent achievement in operating the antiproton source and the Sp̄pS collider. We also thank the EP and SPS Divisions for their extensive support during the running of the experiment. We would also like to thank the earlier members of the UA6 Collaboration for their support in the initial stages of the experiment. We gratefully acknowledge the dedicated support of the UA6 technical and secretarial staff. We acknowledge financial support from the following funding agencies: Swiss Science Foundation, and US Department of Energy and National Science Foundation.


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