Re-visiting Direct $J/ψ$ Production at the Fermilab Tevatron
| dc.creator | Hagiwara, K. | |
| dc.creator | Qi, W. | |
| dc.creator | Qiao, C. F. | |
| dc.creator | Wang, J. X. | |
| dc.date | 2007-05-06 | |
| dc.date | 2008-10-20 | |
| dc.date.accessioned | 2026-07-07T10:11:06Z | |
| dc.date.available | 2026-07-07T10:11:06Z | |
| dc.description | We re-analyze the direct $\jp$ production processes at the Fermilab Tevatron in view of the recent observation at the B-factories, where both $\jp$ inclusive and exclusive production rates are found to be about an order of magnitude larger than the leading order estimates of non-relativistic QCD. The charm quark fragmentation to $\jp$, which is the dominant color-singlet process at high $p_T$, is normalized by the B-factory measurements. The process receives further enhancement due to the charm sea contribution which has so far been ignored in most analyses. After summing up all sub-process contributions, we find that the color-singlet mechanism alone can account for 20% to 90% of the observed direct $\jp$ high $p_T$ production. The polarization rate of the directly produced $\jp$ is sensitive to the fraction of the color-octet contribution, which is employed to fill the gap between the color-singlet prediction and experimental data. With a bigger $K$-factor for the charm quark fragmentation probability, we envisage a smaller matrix element for the color-octet $^3S_1^{(8)}$ state, and this can be examined at the LHC in near future. | |
| dc.description | Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages, LaTeX, 4 eps figures | |
| dc.identifier | https://arxiv.org/abs/0705.0803 | |
| dc.identifier | http://arxiv.org/abs/0705.0803 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/171761 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Re-visiting Direct $J/ψ$ Production at the Fermilab Tevatron | |
| dc.type | text |