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arXiv · 1401.6918

Next-to-Leading-Order study on the associate production of $J/ψ+γ$ at the LHC

Rong Li·Jian-Xiong Wang
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Abstract

The associate $J/ψ+γ$ production at the LHC is studied completely at next-to-leading-order (NLO) within the framework of nonrelativistic QCD. By using three sets of color-octet long-distance matrix elements (LDMEs) obtained in previous prompt $J/ψ$ studies, we find that only one of them can result in a positive transverse momentum ($p_t$) distribution of $J/ψ$ production rate at large $p_t$ region. Based on reasonable consideration to cut down background, our estimation is measurable upto $p_t=50$GeV with present data sample collected at $8$TeV LHC. All the color-octet LDMEs in $J/ψ$ production could be fixed sensitively by including this proposed measurement and our calculation, and then confident conclusion on $J/ψ$ polarization puzzle could be achieved.

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Rong Li, Jian-Xiong Wang. 2014-01-27. Next-to-Leading-Order study on the associate production of $J/ψ+γ$ at the LHC. https://doi.org/10.1103/physrevd.89.114018

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