Article (Scientific journals)
New contributions to heavy-quarkonium production
Lansberg, Jean-Philippe; Cudell, Jean-René; Kalinovsky, Y. L.
2006In Physics Letters B, 633 (2-3), p. 301-308
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Keywords :
heavy-quarkonium production; vector-meson production; gauge invariance; relativistic effects; non-static extension
Abstract :
[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.
Disciplines :
Physics
Author, co-author :
Lansberg, Jean-Philippe ;  Université de Liège - ULiège > Département d'astrophys.
Cudell, Jean-René  ;  Université de Liège - ULiège > Département d'astrophys.
Kalinovsky, Y. L.
Language :
English
Title :
New contributions to heavy-quarkonium production
Publication date :
09 February 2006
Journal title :
Physics Letters B
ISSN :
0370-2693
eISSN :
1873-2445
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
633
Issue :
2-3
Pages :
301-308
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 06 January 2009

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