Asymmetry of prompt photon production in p-p collisions at RHIC

Summary. − The prompt photon production in ~p − ~p collisions at high energies is studied. Double-spin asymmetry A LL of the process is calculated by using Monte Carlo code SPHINX. A possibility to discriminate the spin-dependent gluon distributions and to determine sign of ∆ G is discussed. Detailed study of expected background, such as π 0 production and decay, is given. The predictions for the longitudinal asymmetry A LL of the prompt photons and π 0 -meson production in the ~p − ~p collisions at RHIC energies have been made.