On collinearization of quarks in the quark-gluon decays of heavy orthoquarkonia

Abstract

The decay of heavy orthoquarkonium into quark-antiquark pair and two gluons is considered. The differential probability of the decay in the tree approximation is calculated and the probability distributions of quarks and gluons are obtained. The collinear enhancement of the bottomonium decay is shown to take place at the uū--, dd̄ and ss̄-- pair production and to be absent at the cc̄-- production. Some other peculiarities of the considered decays are discussed. (Published in Mod.Phys.Lett A 9 (1994) 115).

Comments: 7 pages, LaTeX, Yaroslavl, Yaroslavl State University preprint YARU-HE-93/01. (the figures are not included)