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Lattice study of quark and glue momenta and angular momenta in the nucleon
XQCD Collaboration
2015
发表期刊PHYSICAL REVIEW D
卷号91期号:1页码:14505
文章类型Article
摘要We report a complete calculation of the quark and glue momenta and angular momenta in the proton. These include the quark contributions from both the connected and disconnected insertions. The quark disconnected insertion loops are computed with Z(4) noise, and the signal-to-noise ratio is improved with unbiased subtractions. The glue operator is comprised of gauge-field tensors constructed from the overlap operator. The calculation is carried out on a 163 x 24 quenched lattice at beta = 6.0 for Wilson fermions with kappa = 0.154, 0.155, and 0.1555, which correspond to pion masses at 650, 538, and 478 MeV, respectively. The chirally extrapolated u and d quark momentum/angular momentum fraction is found to be 0.64(5)=0.70(5), the strange momentum/angular momentum fraction is 0.024(6)/0.023(7), and that of the glue is 0.33(6)/0.28(8). The previous study of quark spin on the same lattice revealed that it carries a fraction of 0.25(12) of proton spin. The orbital angular momenta of the quarks are then obtained from subtracting the spin from their corresponding angular momentum components. We find that the quark orbital angular momentum constitutes 0.47(13) of the proton spin with almost all of it coming from the disconnected insertions.
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.91.014505
收录类别SCI
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000348678700004
引用统计
被引频次:25[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228140
专题理论物理室
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XQCD Collaboration. Lattice study of quark and glue momenta and angular momenta in the nucleon[J]. PHYSICAL REVIEW D,2015,91(1):14505.
APA XQCD Collaboration.(2015).Lattice study of quark and glue momenta and angular momenta in the nucleon.PHYSICAL REVIEW D,91(1),14505.
MLA XQCD Collaboration."Lattice study of quark and glue momenta and angular momenta in the nucleon".PHYSICAL REVIEW D 91.1(2015):14505.
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