Journal
PHYSICS LETTERS B
Volume 633, Issue 2-3, Pages 301-308Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2005.11.073
Keywords
heavy-quarkonium production; vector-meson production; gauge invariance; relativistic effects; non-static extension
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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 P-T for J/psi. In the psi' case, theoretical uncertainties are shown to be large and agreement with data is possible. (c) 2005 Elsevier B.V. All rights reserved.
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