Study of polarized gluon distributions in diffractive reactions at HERA.pdfVIP

Study of polarized gluon distributions in diffractive reactions at HERA S.V.Goloskokov 9 9 Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 9 1 141980, Moscow region, Russia. l u J Abstract: We consider the dependencies of spin asymmetries in the diffractive ¯ 0 J/Ψ and QQ leptoproduction at HERA energies on the structure of the pomeron- 2 proton coupling. It is shown that it is difficult to study the spin structure of the 1 pomeron coupling with the proton from the All asymmetry. The AlT asymmetry is v an appropriate object for this investigation. 9 2 4 Now the pomeron nature is a problem of topical interest due to the progress in analysis of 7 ¯ 0 diffractive processes at HERA [1]. Investigation of the diffractive vector meson and QQ pro- 9 duction should give fertile information on the pomeron structure and on the gluon distribution 9 ¯ / at small x. The diffractive J/Ψ and heavy QQ production have a significant role here. The h p predominant contribution in such processes is determined by a color singlet t -channel exchange - (pomeron). In the QCD-inspired models, the pomeron is modeled by two gluons [2]. The two– p e gluon couplings with the proton in diffractive processes at small x can be expressed in terms of h skewed gluon distribution in the nucleon FX (X + ∆) with X ∼ (Q2 + M2 )/W 2 , ∆ ≪ X , where : V v X + ∆ is a fraction of the proton momentum carrie