Direct photon production from pions and protons at 200 GeV/c.

Authors :: Badier, J.
Bardadin-Otwinowska, M.
Bemporad, C.
Berthon, U.
Bienvenu, H.
Boucrot, J.
Bourotte, J.
Burgun, G.
Callot, O.
Charpentier, Ph.
Cnops, A.
Cohen, M.
Constantini, F.
Crozon, M.
Décamp, D.
Delpierre, P.
Detoeuf, J.
Espigat, P.
Gandois, B.
Giannini, G.
Source :: Zeitschrift für Physik. C, Particles & Fields; 1986, Vol. 31 Issue 3, p341-347, 7p
Publication Year :: 1986
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≦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. [ABSTRACT FROM AUTHOR]