Quark spins and anomalous Ward identity

doi:10.1103/PhysRevD.98.074505

	Quark spins and anomalous Ward identity
	XQCD Collaboration
刊名	PHYSICAL REVIEW D
	2018
卷号	98 期号:7 页码:74505
ISSN号	2470-0010
DOI	10.1103/PhysRevD.98.074505
文献子类	Article
英文摘要	We calculate the intrinsic quark spin contribution to the total proton spin using overlap valence quarks on three ensembles of 2 + 1-flavor RBC/UKQCD domain-wall configurations with different lattice spacings. The lowest pion mass of the ensembles is around 171 MeV, which is close to the physical point. With overlap fermions and a topological charge derived from the overlap operator, we verify the anomalous Ward identity between nucleon states with momentum transfer. Both the connected and the disconnected insertions of the axial-vector current are calculated. For the disconnected-insertion part, the cluster-decomposition error reduction technique is utilized for the lattice with the largest volume and the error can be reduced by 10%-40%. Nonperturbative renormalization is carried out and the final results are all reported in the (MS) over bar scheme at 2 GeV. We determine the total quark spin contribution to the nucleon spin to be Delta Sigma = 0.405(25) (37), which is consistent with the recent global fitting result of experimental data. The isovector axial coupling we obtain in this study is g(A)(3) = 1.254(16)(30), which agrees well with the experimental value of 1.2723(23).
电子版国际标准刊号	2470-0029
WOS关键词	GINSPARG-WILSON FERMION ; OVERLAP DIRAC OPERATOR ; LATTICE GAUGE-THEORY ; QCD ; PROTON ; RENORMALIZATION ; SCATTERING
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000446908500006
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286399]
专题	高能物理研究所_理论物理室
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	XQCD Collaboration. Quark spins and anomalous Ward identity[J]. PHYSICAL REVIEW D,2018,98(7):74505.
APA	XQCD Collaboration.(2018).Quark spins and anomalous Ward identity.PHYSICAL REVIEW D,98(7),74505.
MLA	XQCD Collaboration."Quark spins and anomalous Ward identity".PHYSICAL REVIEW D 98.7(2018):74505.