Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass

被引：98

作者：

Alexandrou, C. ^{[1
,2
]}

Bacchio, S. ^{[2
]}

Constantinou, M. ^{[3
]}

Finkenrath, J. ^{[2
]}

Hadjiyiannakou, K. ^{[1
,2
]}

Jansen, K. ^{[4
]}

Koutsou, G. ^{[2
]}

Panagopoulos, H. ^{[1
]}

Spanoudes, G. ^{[1
]}

机构：

[1] Univ Cyprus, Dept Phys, POB 20537, CY-1678 Nicosia, Cyprus

[2] Cyprus Inst, Computat Based Sci & Technol Res Ctr, 20 Kavafi St, CY-2121 Nicosia, Cyprus

[3] Temple Univ, Dept Phys, 1925 N 12th St, Philadelphia, PA 19122 USA

[4] DESY, NIC, Platanenallee 6, D-15738 Zeuthen, Germany

来源：

PHYSICAL REVIEW D | 2020年 / 101卷 / 09期

基金：

欧盟地平线“2020”; 美国国家科学基金会;

关键词：

DEEP-INELASTIC-SCATTERING; NONPERTURBATIVE RENORMALIZATION; ASYMMETRY; POLARIZATION; SYSTEMS; TENSOR; G1;

D O I：

10.1103/PhysRevD.101.094513

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We evaluate the gluon and quark contributions to the spin of the proton using an ensemble of gauge configurations generated at physical pion mass. We compute all valence and sea quark contributions to high accuracy. We perform a nonperturbative renormalization for both quark and gluon matrix elements. We find that the contribution of the up, down, strange, and charm quarks to the proton intrinsic spin is 1/2 Sigma(q=u,d,s,c) Delta Sigma(q+) = 0.191(15) and to the total spin Sigma(q=u,d,s,c) Jq(+) = 0.285(45)(10). The gluon contribution to the spin is J(g) = 0.187(46)(10) yielding J = J(q) + J(g) = 0.473(71)(14) confirming the spin sum. The momentum fraction carried by quarks in the proton is found to be 0.618(60) and by gluons 0.427(92), the sum of which gives 1.045(118) confirming the momentum sum rule. All scale and scheme dependent quantities are given in the (MS) over bar scheme at 2 GeV.

引用

页数：28

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