Lattice QCD evaluation of the Compton amplitude employing the Feynman-Hellmann theorem

Lattice QCD evaluation of the Compton amplitude employing the Feynman-Hellmann theorem
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使用 Feynman-Hellmann 定理对康普顿振幅进行格子 QCD 评估

DOI:
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发表时间:
2020
期刊:
影响因子:
5
通讯作者:
J. Zanotti
J. Zanotti
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
K. U. Can;A. Hannaford;R. Horsley;Y. Nakamura;H. Perlt;P. Rakow;G. Schierholz;K. Somfleth;H. Stüben;R. Young;J. Zanotti

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正向康普顿振幅描述了强子的虚光子散射过程,为理解强子的结构提供了重要的信息。作为一个物理振幅,康普顿张量自然包括所有目标质量修正和在固定虚度下的更高扭曲效应,$Q^2$。利用二阶Feynman-Hellmann定理,在晶格QCD中计算了非物理夸克质量下的核子康普顿张量,范围为光子动量$3\less sim Q^2\less sim 7$GeV$^2$.这使得第一次在晶格计算中研究核子结构函数的低阶矩对$q^2$的依赖性。结果表明,对功率修正和部分子渐近性的系统研究现已触手可及。
The forward Compton amplitude describes the process of virtual photon scattering from a hadron and provides an essential ingredient for the understanding of hadron structure. As a physical amplitude, the Compton tensor naturally includes all target mass corrections and higher twist effects at a fixed virtuality, $Q^2$. By making use of the second-order Feynman-Hellmann theorem, the nucleon Compton tensor is calculated in lattice QCD at an unphysical quark mass across a range of photon momenta $3 \lesssim Q^2 \lesssim 7$ GeV$^2$. This allows for the $Q^2$ dependence of the low moments of the nucleon structure functions to be studied in a lattice calculation for the first time. The results demonstrate that a systematic investigation of power corrections and the approach to parton asymptotics is now within reach.
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影响因子: 5
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