HIGHER ORDERS IN THE COLOR-OCTET MODEL OF J PSI PRODUCTION/

Authors
Citation
S. Gupta et P. Mathews, HIGHER ORDERS IN THE COLOR-OCTET MODEL OF J PSI PRODUCTION/, Physical review. D. Particles and fields, 56(5), 1997, pp. 3019-3029
Citations number
29
Categorie Soggetti
Physics, Particles & Fields
ISSN journal
05562821
Volume
56
Issue
5
Year of publication
1997
Pages
3019 - 3029
Database
ISI
SICI code
0556-2821(1997)56:5<3019:HOITCM>2.0.ZU;2-#
Abstract
We study the hadroproduction and photoproduction of (c) over bar c and (b) over bar b mesons at low transverse momentum to high orders in th e relative velocity of the pair, nu, in nonrelativistic QCD. We evalua te cross sections to order nu(7) for eta(c), sufficient for studies of photoproduction in the almost-elastic region. For all other charmoniu m states we find the cross section to order nu(9), sufficient for stud ies of the ratio of chi(c1) and chi(c2) production rates. We find recu rrence formulas for generating terms at even higher orders, should the y be needed.