New contributions to heavy-quarkonium production

Details New contributions to heavy-quarkonium production New contributions to heavy-quarkonium production

2005-07-05

arxiv.org/abs/hep-ph/0507060v3

Phys.Lett. B633 (2006) 301-308

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 12 figures, LaTeX. References updated, typo fixed, discussion of the scale dependence, minor corrections to the text

Scientific paper

10.1016/j.physletb.2005.11.073

We reconsider quarkonium production in a field-theoretical setting and we show that the lowest-order mechanism for heavy-quarkonium production receives in general contributions from two different cuts. The first one corresponds to the usual colour-singlet mechanism. The second one has not been considered so far. We treat it in a gauge-invariant manner, and introduce new 4-point vertices, suggestive of the colour-octet mechanism. These new objects enable us to go beyond the static approximation. We show that the contribution of the new cut can be as large as the usual colour-singlet mechanism at high transverse momentum for J/psi. In the psi' case, theoretical uncertainties are shown to be large and agreement with data is possible.

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