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Direct photon production from pions and protons at 200 GeV/c |
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| Authors: | J Badier M Bardadin-Otwinowska C Bemporad U Berthon H Bienvenu J Boucrot J Bourotte G Burgun O Callot Ph Charpentier A M Cnops M Cohen F Constantini M Crozon D Décamp P Delpierre J F Detoeuf P Espigat B Gandois G R Giannini V Hajjar M Hansroul Y Karyotakis P Lariccia P Le D? J Mas A Michelini G C Moneti M Moniez E Paré G Rahal-Callot M Rumpf O Runolfsson A Tilquin S Weisz NA Collaboration |
| Institution: | 1. Ecole Polytechnique, F-91128, Palaiseau, France 2. CERN, Geneva, CH-1211, Geneva 23, Switzerland 3. Laboratoire de l'Accélérateur Linéaire, F-91405, Orsay, France 5. Istituto di Fisica, Universita di Pisa, Piazza Torricelli 2, I-56100, Pisa, Italy 6. Sezione di Pisa, INFN, I-56010, Pisa, Italy 7. CEN, Saclay, F-91191, Gif sur Yvette, France 8. Collège de France, F-75231, Paris, France |
| Abstract: | Direct photon production has been studied by an experiment performed with the NA3 spectrometer at CERN, using incident negative and positive beams at 200 GeV/c interacting with an isoscalar Carbon target. Two different triggers have been used; one of them requires the photon conversion. The experiment is sensitive to direct photons produced with 3.0≦P T ≦6 GeV/c and center-of-mass rapidity ?0.4≦y *≦1.2. Inclusive cross sections are given for incident π± and protons, and compared with second order QCD predictions; finally an estimation of the gluon structure function of the nucleon is given. |
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