Off-shell and non-static contributions to heavy-quarkonium production
| dc.creator | Lansberg, J. P. | |
| dc.date | 2006-10-29 | |
| dc.date.accessioned | 2026-07-07T10:25:50Z | |
| dc.date.available | 2026-07-07T10:25:50Z | |
| dc.description | We have shown that if one relaxes the constraint that the quarks in a heavy quarkonium are at rest and on-shell, new contributions to the discontinuity of the production amplitude appear. These can be seen as a s-cut in the amplitude and are on the same footage as the classical cut of the Colour-Singlet Model (CSM), where the heavy quarks forming the quarkonium are put on-shell by hypothesis. We treat this cut in a gauge-invariant manner by introducing necessary new 4-point vertices, suggestive of the colour-octet mechanism. We have further shown that this cut contributes at least as much as the LO CSM at large P_T. However, the 4-point vertices cannot be totally constrained and an ambiguity remains to what concerns their actual contribution. Theoretical insights from meson photoproduction are discussed in that context. | |
| dc.description | Presented at the 7th International Conference on Quark Confinement and Hadron Spectrum (QCHS7), September 2-7 2006, Ponta Delgada, Portugal and at the 4th Meeting of the Quarkonium Working Group, June 27-30 2006, BNL, USA, 4 pages, 3 figures, LaTeX, uses aip-6s.clo, aipproc.cls and aipxfm.sty (included) | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0610393 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0610393 | |
| dc.identifier | AIPConf.Proc.892:324-326,2007 | |
| dc.identifier | doi:10.1063/1.2714407 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/176672 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Off-shell and non-static contributions to heavy-quarkonium production | |
| dc.type | text |