Next-to-Leading-Order QCD corrections to J/ψ(Υ)+γproduction at the LHC

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dc.creatorLi, Rong
dc.creatorWang, Jian-Xiong
dc.date2008-11-06
dc.date2009-01-12
dc.date.accessioned2026-07-07T12:36:21Z
dc.date.available2026-07-07T12:36:21Z
dc.descriptionIn this work, we calculate the next-to-leading-order (NLO) QCD corrections to the process $p+p \to J/ψ+ γ$ via the color-singlet mechanism at the LHC. The results show that the partial cross section ($p_t^{J/ψ}>$3GeV and $|y^{J/ψ,γ}|<$3) is enhanced by a factor of about 2.0, and the differential cross section can be enhanced by two orders of magnitude in the large transverse momentum region of $J/ψ$. Furthermore, the polarization of $J/ψ$ changes from transverse polarization at leading-order to longitudinal polarization at NLO. For the inclusive $J/ψ$ hadroproduction, it is known that the color-octet contributions are one order of magnitude larger than the color-singlet contribution, and the polarization distribution is dominated by the color-octet behavior at NLO. In contrast, for $J/ψ+γ$ production the color-singlet contribution is of the same order as the color-octet contribution, and the polarization distribution arises from both the color-singlet and color-octet. Therefore, measurements of $J/ψ$ production associated with a direct photon at the hadron collider could be an important supplement to testify the theoretical framework treating with the heavy quarkonium. In addition, an NLO QCD correction to $Υ+γ$ production at the LHC is also presented in this paper.
dc.description13 pages, 6 figures, 1 table
dc.identifierhttps://arxiv.org/abs/0811.0963
dc.identifierhttp://arxiv.org/abs/0811.0963
dc.identifierPhys.Lett.B672:51-55,2009
dc.identifierdoi:10.1016/j.physletb.2008.12.050
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218064
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNext-to-Leading-Order QCD corrections to J/ψ(Υ)+γproduction at the LHC
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