Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-04-28
Phys.Rev.Lett.86:1446-1449,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 5 figures, final PRL version
Scientific paper
10.1103/PhysRevLett.86.1446
The cross section of \chi_{cJ} hadroproduction is calculated in the k_t-factorization approach. We find a significant contribution of the \chi_{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.
Hägler Ph.
Kirschner Roland
Sch{ä}fer Andreas
Szymanowski Lech
Teryaev Oleg V.
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