Zusammenfassung
The cross section of chi (cJ) hadroproduction is calculated in the k(perpendicular to)-factorization approach. We find a significant contribution of the chi (cl) 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 ...
Zusammenfassung
The cross section of chi (cJ) hadroproduction is calculated in the k(perpendicular to)-factorization approach. We find a significant contribution of the chi (cl) 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 long-standing controversy between the color-singlet model and the color-octet mechanism.
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