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.
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收藏
页码：1446 / 1449
页数：4
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