Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-01-06
Phys.Rev. D51 (1995) 6139-6145
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 page Latex file using epsf.sty for figures. 6 eps figures submitted separately in uuencoded file.
Scientific paper
10.1103/PhysRevD.51.6139
A global QCD analysis of the direct photon production process from both fixed target and collider experiments is presented. These data sets now completely cover the parton $x$ range from 0.01 to 0.6, thereby providing a stringent test of perturbative QCD and parton distributions. Previous detailed studies of direct photons emphasized fixed target data. We find most data sets have a steeper $p_t$ distribution than the QCD prediction. Neither global fits with new parton distributions nor improved photon fragmentation functions can resolve this problem since the deviation occurs at different $x$ values for experiments at different energies. A more likely explanation is the need for additional broadening of the $k_t$ of the initial state partons. The magnitude and the possible physical origin of this effect are investigated and discussed.
Huston Joey
Kovacs Edith
Kuhlmann Salma
Lai Hung-Liang
Owens Joseph F.
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