Direct J/ψ hadroproduction in k⊥ factorization and the color octet mechanism -: art. no. 077501

被引：58

作者：

Hägler, P

Kirschner, R

Schäfer, A

Szymanowski, L

Teryaev, OV

机构：

[1] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[2] Univ Leipzig, Inst Theoret Phys, D-04109 Leipzig, Germany

[3] Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland

[4] Joint Inst Nucl Res Dubna, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia

来源：

PHYSICAL REVIEW D | 2001年 / 63卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.63.077501

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The hadroproduction of direct J/psi, in the framework of the k(perpendicular to)-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-8(J/psi)(S-3(1))\0) substantially decreased in comparison with fits in the collinear factorization. This should lead to a reduction of the large transverse polarization, predicted in the collinear approach.

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