'gamma + jet' event rate estimation for gluon distribution determination at the Tevatron Run II

Since a lot of theoretical predictions on the production of new particles (Higgs, SUSY) at the Tevatron are based on model estimations of the proton gluon density behaviour at low x and high values of a transferred momentum Q sup 2 , the study of a possibility of a measurement of the gluon density in this kinematic region directly in Tevatron experiments is obviously of a big interest. The background events suppression factors and corresponding signal events selection efficiencies are determined here. The estimation of the number of 'gamma + jet' events suitable for measurement of gluon distribution in different x and Q sup 2 intervals at Tevatron Run II is also done. It is shown that with integrated luminosity L sub i sub n sub t = 3 fb sup - sup 1 it would be possible to collect about one million of these events. This number would allow one to cover a new kinematical region, 10 sup - sup 3 < x < 1.0 with 1.6 centre dot 10 sup 3 <= 2 centre dot 10 sup 4 (GeV/c) sup 2 , not studied in any previous experiments. This area includes the values of Q sup 2 that are, on the average, by about one order of magnitude higher than those reached at HERA now. The rates of gc -> gamma sup d sup i sup r + jet event are also obtained