Reference : New contributions to heavy-quarkonium production
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
New contributions to heavy-quarkonium production
Lansberg, Jean-Philippe mailto [Université de Liège - ULg > Département d'astrophys.]
Cudell, Jean-René mailto [Université de Liège - ULg > Département d'astrophys.]
Kalinovsky, Y. L. [> > > >]
Physics Letters B
Elsevier Science Bv
Yes (verified by ORBi)
[en] heavy-quarkonium production ; vector-meson production ; gauge invariance ; relativistic effects ; non-static extension
[en] 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.

File(s) associated to this reference

Fulltext file(s):

Open access
New_contributions.pdfAuthor preprint266.64 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.