Higher Orders in the Colour-Octet Model of J/ψProduction

Details Higher Orders in the Colour-Octet Model of J/ψProduction Higher Orders in the Colour-Octet Model of J/ψProduction

1997-03-20

arxiv.org/abs/hep-ph/9703370v1

Phys.Rev. D56 (1997) 3019-3029

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages including 5 Postscript figures, LaTeX

Scientific paper

10.1103/PhysRevD.56.3019

We study the hadro- and photo-production of $\bar cc$ and $\bar bb$ mesons at low transverse momentum to high orders in the relative velocity of the pair, v, in non-relativistic QCD. We evaluate cross sections to order v^7 for $\eta_c$, sufficient for studies of photo-production in the almost-elastic region. For all other charmonium states we find the cross section to order v^9, sufficient for studies of the ratio of $\chi_{c1}$ and $\chi_{c2}$ production rates. We find recurrence formulae for generating terms at even higher orders, should they be needed.

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