Direct photon production in pp and pp interactions at √s = 24.3 GeV

G. Sozzi, G. Ballocchi, A. Bernasconi, R. E. Breedon, L. Camilleri, R. L. Cool, P. T. Cox, P. Cushman, L. Dick, E. C. Dukes, B. Gabioud, F. Gaille, P. Giacomelli, D. Hubbard, J. B. Jeanneret, C. Joseph, W. Kubischta, J. F. Loude, E. Malamud, C. MorelP. Oberson, O. E. Overseth, J. L. Pagès, J. P. Perroud, D. Rüegger, R. W. Rusack, V. Singh, G. R. Snow, D. Steiner, L. Studer, M. T. Tran, A. Vacchi, G. Valenti, M. Werlen

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23 Scopus citations

Abstract

Inclusive direct photon invariant cross sections have been measured in both pp and pp collisions at √s = 24.3 GeV at the CERN SPS, permitting the first measurement of the difference of the pp and pp cross sections. The direct photon cross section in pp collisions has been found to be systematically larger than that in pp collisions, which indicates a significant contribution of the qq annihilation term as predicted by theoretical calculations.

Original languageEnglish (US)
Pages (from-to)243-249
Number of pages7
JournalPhysics Letters B
Volume317
Issue number1-2
DOIs
StatePublished - Nov 4 1993

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