Double charmonium production atBfactories within light cone formalism

Abstract

′ c within light cone formalism. It is shown that if one disregards the contribution of higher fock states, the twist-3 distribution amplitudes needed in the calculation can be unambiguously determined from the twist-2 distribution amplitudes and equations of motion. Using models of the twist-2 distribution amplitudes the cross sections of the processes under study have been calculated. The results of the calculation are in agreement with Belle and BaBar experiments. It is also shown that relativistic and radiative corrections to the cross sections play crucial role in the achievement of the agreement between the theory and experiments. The comparison of the results of this paper with the results obtained in other papers has been carried out. In particular, it is shown that the results of papers where relativistic and radiative corrections were calculated within NRQCD are overestimated by a factor of ∼ 1.5.

ExclusiveC=+charmonium production ine+e−→H+γatБрагута1 2010Phys. Rev. DSelf Cite

“…The values of the constants f ηc , f η ′ c were calculated in paper [24]. The values of the constants of the P -wave charmonia mesons can be found in paper [16].…”

O(αs) corrections to e+Dong1, Feng2, Jia3 2018Phys. Rev. D7190View full textAdd to dashboardCite

“…The original lowest-order (LO) NRQCD predictions to this process [10,11] is about 1 order of magnitude smaller than the measurement [1]. This alarming discrepancy has triggered a great amount of theoretical investigations in both NRQCD and light-cone approaches [12][13][14][15][16][17][18][19][20][21][22]. One crucial element in alleviating the discrepancy between the NRQCD prediction and the data is the substantial and positive next-to-leading-order (NLO) perturbative corrections [16,17].…”

Double charmonium production in exclusive bottomonia decays

“…It should be noted that this approximation cannot be considered as reliable. This conclusion can be drawn from the experience obtained in the study of double charmonium production at B factories [20], which tells us that relativistic and radiative corrections to double charmonia production can be very large. Nevertheless, in this paper the leading order approximation of NRQCD will be used to get an independent estimation of the widths of the exclusive bottomonia decays under study.…”

“…There were many attempts to resolve this discrepancy [7][8][9][10][11][12][13][14][15][16][17]. Lately, it has been shown that the agreement between theory and experiment can be achieved if one takes into account radiative and relativistic corrections to the cross sections [18][19][20].…”