Elsevier

Physics Letters B

Volume 317, Issues 1–2, 4 November 1993, Pages 243-249
Physics Letters B

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

https://doi.org/10.1016/0370-2693(93)91600-RGet rights and content

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.

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1

Present address: KEK 1-1-OHO, Tsukuba-Shi Ibaraki-Ken 305, Japan.

2

Deceased.

3

Present address: INFN, I-20133 Milan, Italy.

4

Present address: University of Virginia, VA 22901, USA.

5

Present address: Fermilab, Batavia, IL 60510, USA.

6

Present address: Università di Trieste, I-34127 Trieste, Italy.

7

Present address: INFN, I-40126 Bologna, Italy.

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