ON THE APPLICATION OF "g + jet" PROCESS FOR SETTING THE ABSOLUTE SCALE OF JET ENERGY AND FOR DETERMINING THE GLUON DISTRIBUTION AT THE TEVATRON IN RUN II

D. V. Bandurin, N. B. Skachkov

The effect of application of a new set of criteria, proposed in our previous works, for the improvement of a jet energy calibration accuracy with the process "p`p ® g+jet+X" at Tevatron and for a reduction of the background events contribution are studied. The efficiencies of the used selection criteria are estimated. The distributions of these events over Pt ^gand h^jet are presented. The features of "g+ jet" events in the central calorimeter region of the D0 detector (|h|< 0.7) are investigated. It is also shown that the samples of "g + jet" events, selected with the cuts used for the jet energy calibration, may have the statistics sufficient for determining the gluon distribution function of a proton in the region of 2*10^-3< x< 1.0 and at Q² values of 1.6*10³ Q² 2*10⁴ (GeV/c)² which are by one order higher than those reached in the experiments at HERA. Monte-Carlo events produced by the PYTHIA 5.7 generator are used for this aim.