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

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

2008-11-06

arxiv.org/abs/0811.0963v2

Phys.Lett.B672:51-55,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 6 figures, 1 table

Scientific paper

10.1016/j.physletb.2008.12.050

In this work, we calculate the next-to-leading-order (NLO) QCD corrections to the process $p+p \to J/\psi + \gamma$ via the color-singlet mechanism at the LHC. The results show that the partial cross section ($p_t^{J/\psi}>$3GeV and $|y^{J/\psi,\gamma}|<$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 $J/\psi$. Furthermore, the polarization of $J/\psi$ changes from transverse polarization at leading-order to longitudinal polarization at NLO. For the inclusive $J/\psi$ 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 $J/\psi+\gamma$ 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 $J/\psi$ 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 $\Upsilon+\gamma$ production at the LHC is also presented in this paper.

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