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Diffractive leptoproduction of heavy quarkonium in pQCD

机译:pQCD中重性kon的衍射p产生

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摘要

Systematic analysis for the kinematical corrections of cc-system in the diffractive lepto-productions of charmonia (1S, 2S) is presented within the light-cone perturbation theory. In the convolution of perturbative parts in the light-cone wave functions of a photon and a charmonium, the corrections are evaluated up to the order O(k_⊥~2/m_c~2) with k_⊥ being the relative momentum of cc-system and m_c the charm quark mass. We find the corrections to reduce effectively the large suppression by Fermi-motion effects predicted so far and strongly enhance the total cross sections of both J/ψ and ψ' productions. In addition, good agreement with recent data on Q~2 and s~(1/2) at HERA suggests that such systematic analysis is more reasonable in the color-dipole picture. We also discuss about the diffractive leptoproduction of botomonium, which could reduce an ambiguity from the Fermi-motion effect because of the heavier mass than the charm quark.
机译:在圆锥锥摄动理论中,提出了对角膜锥虫(1S,2S)衍射幼体产物中cc系统运动学校正的系统分析。在光子和a的光锥波函数中的扰动部分的卷积中,校正的评估达到O(k_⊥〜2 / m_c〜2)阶,其中k_⊥是cc系统的相对动量和m_c夸克质量。我们发现这些修正可以有效地减少迄今为止所预测的费米运动效应所产生的较大抑制,并可以极大地增强J /ψ和ψ'产品的总横截面。此外,与HERA的Q〜2和s〜(1/2)的最新数据吻合良好,这表明这种系统的分析在彩色偶极子图像中更为合理。我们还讨论了关于omo的衍射p变生产,由于质量比魅力夸克重,它可以减少费米运动效应带来的歧义。

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