Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-08-30
Phys.Rev.D63:077501,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
3 pages, LaTeX, 2 eps figures, final PRD version
Scientific paper
10.1103/PhysRevD.63.077501
The hadroproduction of direct J/Psi in the framework of the k_\perp-factorization approach is studied. The color-singlet contribution is essentially larger than in the collinear approach but is still an order of magnitude below the data. The deficit may be well described by the color octet contribution with the value of the matrix element <0|O^{J/\Psi}_8(^3S_1)|0> substantially decreased in comparison with the fits in the collinear factorization. This should lead to a reduction of the large transverse polarization, predicted in the collinear approach.
Hägler Ph.
Kirschner Roland
Sch{ä}fer Andreas
Szymanowski Lech
Teryaev Oleg V.
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