Towards a solution of the charmonium production controversy: k(perpendicular to) factorization versus color-octet mechanism

Authors
Hagler, P Kirschner, R Schafer, A Szymanowski, L Teryaev, OV
Citation
P. Hagler et al., Towards a solution of the charmonium production controversy: k(perpendicular to) factorization versus color-octet mechanism, PHYS REV L, 86(8), 2001, pp. 1446-1449
Citations number
25
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
86
Issue
8
Year of publication
2001
Pages
1446 - 1449
Database
ISI
SICI code
0031-9007(20010219)86:8<1446:TASOTC>2.0.ZU;2-#
Abstract
The cross section of chi (cJ) hadroproduction is calculated in the k(perpen dicular to)-factorization approach. We find a significant contribution of t he chi (cl) state due to non-applicability of the Landau-Yang theorem becau se of off-shell gluons. The results are in agreement with data and, in cont rast 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.