格点上一类普适算子的胶子螺旋度δ G
Gluon Helicity Delta G from a Universality Class of Operators on a Lattice
摘要：
我们证明了极化核子中的总胶子螺旋度$ΔG$可以通过描述壳层胶子辐射的螺旋度或极化度的普适性类QCD算符在欧几里德格点上计算。我们特别发现，一些运营商的矩阵元素的核子动量$P^z$直接相关的$ΔG$只有幂律$(1/P^z)^n (n\ge 2)$修正。
英文摘要：
We show that the total gluon helicity $ΔG$ in a polarized nucleon can be calculated on a Euclidean lattice through a universality class of QCD operators that describe the helicity or polarization of the onshell gluon radiation. We in particular find some operators whose matrix elements in a nucleon of momentum $P^z$ are directly related to $ΔG$ with only power-law $(1/P^z)^n (n\ge 2)$ corrections.
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