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Abstract: This paper is devoted to the study of the processes e^+e^- \to J-\Psi \eta c,J-\Psi \eta c-, \psi- \eta c, \psi- \eta c- within light cone formalism. It isshown that if one disregards the contribution of higher fock states, thetwist-3 distribution amplitudes needed in the calculation can be unambiguouslydetermined from the twist-2 distribution amplitudes and equations of motion.Using models of the twist-2 distribution amplitudes the cross sections of theprocesses under study have been calculated. The results of the calculation arein agreement with Belle and BaBar experiments. It is also shown thatrelativistic and radiative corrections to the cross sections play crucial rolein the achievement of the agreement between the theory and experiments. Thecomparison of the results of this paper with the results obtained in otherpapers has been carried out. In particular, it is shown that the results ofpapers where relativistic and radiative corrections were calculated withinNRQCD are overestimated by a factor of ~1.5.



Autor: V.V. Braguta

Fuente: https://arxiv.org/







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