Towards a solution of the charmonium production controversy:: k⊥ factorization versus color-octet mechanism

被引：77

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] Ecole Polytech, Ctr Phys Theor, UMR C7644, Palaiseau, France

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

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.86.1446

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：1446 / 1449

页数：4

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