Investigation of the dynamics of gluon distributions in the production of heavy quarks and quarkonia at the LEP2 colliderстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The inclusive production of heavy quarks and quarkonia in photon-photon collisions at the LEP2 collider is considered within the semihard (kt-factorization) QCD approach. The dependence of the total and differential cross sections for the production of heavy (c and b) quarks and D* and J/psi mesons on the choice Of unintegrated gluon distribution is studied. The transition of a c (c) over bar charmed pair to observed J/psi mesons is described on the basis of the color-singlet model. The results of the calculations are compared with Currently available experimental data obtained by the L3, OPAL, ALEPH, and DELPHI Collaborations. It is shown that the polarization properties of J/psi mesons at the LEP2 collider are sensitive to the behavior Of unintegrated gluon distributions. This means that experimental investigations of the polarization properties of quarkonia in photon-photon collisions may provide a direct test of the dynamics of gluon distributions in the photon.