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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 |
| Affiliation: | 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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