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Exclusive J/Ψ and Ψ(2s) photo-production as a probe of QCD low x evolution equations

机译:独家J /ψ和ψ(2S)照片 - 生产作为QCD低X Evolution方程的探头

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We investigate photo-production of vector mesons J / Ψ and Ψ ( 2 s ) , based on both HERA and LHC data, using 2 fits of unintegrated gluon distributions. The latter are subject to nonlinear Balitsky-Kovchegov evolution (Kutak-Sapeta gluon; KS) and linear next-to-leading order Balitsky-Kuraev-Fadin-Lipatov evolution (Hentschinski-Sabio Vera-Salas; HSS gluon) respectively. Apart from extending previous studies to the case of radially excited charmonium Ψ ( 2 s ) , we further use an improved set of charmonium wave functions, provided in the literature, and give an estimate of the uncertainties associated with the energy dependence of the HSS gluon. While we observe that the difference between linear and non-linear evolution somehow diminishes and a clear distinction between both HSS and KS gluon is not possible using the currently available data set, we find that the differences between both gluon distributions are enhanced for the ratio of the photo-production cross sections of Ψ ( 2 s ) and J / Ψ vector mesons.
机译:我们使用2个未分解的胶合分布来调查Vector Mesons J /ψ和ψ(2s)的照片 - 制作。后者受到非线性Balitsky-Kovchegov Evolution(Kutak-Sapeta gluon; ks)和Linear的下一领先订单Balitsky-Kuraev-Fadin-lipatov Evolution(Hentschinski-Sabio Vera-Salas; HSS gluon)。除了以径向激发越野ψ(2 s)的情况下延伸之前的研究,我们进一步使用文献中提供的改进的一组炭波函数,并估计与HSS Gluon的能量依赖性相关的不确定性。虽然我们观察到线性和非线性演化之间的差异以某种方式减少和使用当前可用的数据集无法进行HSS和KS gluon之间的明确区分,但我们发现两个胶合分布之间的差异增强了比率ψ(2 s)和j /ψ载体介子的光生产横截面。

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