Towards a solution of the charmonium production controversy: kt-factorization versus color octet mechanism
Abstract
The cross section of cJ hadroproduction is calculated in the kt-factorization approach. We find a significant contribution of the c1 state due to non-applicability of the Landau-Yang theorem because of off-shell gluons. The results are in agreement with data and, in contrast to the collinear factorization, show a dominance of the color singlet part and a strong suppression of the color octet contribution. Our results could therefore lead to a solution of the longstanding controversy between the color singlet model and the color octet mechanism.
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