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Insights on proton structure from lattice QCD: The twist-3 parton distribution function gT(x)

机译:从格子QCD的质子结构见解:Twist-3 Parton分布功能GT(x)

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In this work, we present the first-ever calculation of the isovector flavor combination of the twist-3 parton distribution function g T ( x ) for the proton from lattice quantum chromodynamics (QCD). We use an ensemble of gauge configurations with two degenerate light, a strange, and a charm quarks ( N f = 2 + 1 + 1 ) of maximally twisted mass fermions with a clover improvement. The lattice has a spatial extent of 3?fm and lattice spacing of 0.093?fm and reproduces a pion mass of 260?MeV. We use the quasidistribution approach and employ three values of the proton momentum boost, 0.83, 1.25, and 1.67?GeV. We use a source-sink separation of 1.12?fm to suppress excited-states contamination. The lattice data are renormalized nonperturbatively. We calculate the matching equation within Large Momentum Effective Theory, which is applied to the lattice data in order to obtain g T . The final distribution is presented in the MS ˉ scheme at a scale of 2?GeV. We also calculate the helicity distribution g 1 to test the Wandzura-Wilczek approximation for g T . We find that the approximation works well for a broad range of x . This work demonstrates the feasibility of accessing twist-3 parton distribution functions from novel methods within lattice QCD and can provide essential insights into the structure of hadrons.
机译:在这项工作中,我们介绍了来自晶格量子色能(QCD)的质子的Twist-3 Parton分布函数G T(X)的Isovector风味组合的第一计算。我们使用带有两个退化光,奇怪的尺寸和奇迹夸克(n f = 2 + 1 + 1 + 1)的集合配置,具有最大扭曲的质量码头,具有三叶草改善。晶格的空间程度为3?FM和晶格间距为0.093?FM,再现260的π粒子。我们使用Quasidributive方法,采用质子势头的三个值,0.83,1.25和1.67?GEV。我们使用1.12?FM的源区分离,以抑制兴奋状态污染。晶格数据不受禁止的重整化。我们计算大量动量有效理论的匹配方程,其应用于晶格数据以获得G T.最终分布在MSˉ方案中以2?GEV的等级呈现。我们还计算螺旋分布G 1来测试G T的Wandzura-Wilczek近似。我们发现近似适用于广泛的x。这项工作展示了从格子QCD内的新方法访问Twist-3 Parton分布功能的可行性,并可以为强子结构提供必要的见解。

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