Higher orders in the color-octet model of J/ψ production

Gupta, Sourendu ; Mathews, Prakash (1997) Higher orders in the color-octet model of J/ψ production Physical Review D - Particles, Fields, Gravitation and Cosmology, 56 (5). pp. 3019-3029. ISSN 1550-7998

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Official URL: http://prd.aps.org/abstract/PRD/v56/i5/p3019_1

Related URL: http://dx.doi.org/10.1103/PhysRevD.56.3019


We study the hadroproduction and photoproduction of c̅ c and b̅ b mesons at low transverse momentum to high orders in the relative velocity of the pair, v, in nonrelativistic QCD. We evaluate cross sections to order v7 for ηc, sufficient for studies of photoproduction in the almost-elastic region. For all other charmonium states we find the cross section to order v9, sufficient for studies of the ratio of Χc1 and Χc2 production rates. We find recurrence formulas for generating terms at even higher orders, should they be needed.

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