Proton and neutron electromagnetic form factors from lattice QCD

被引：59

作者：

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

Bacchio, S. ^{[1
]}

Constantinou, M. ^{[3
]}

Finkenrath, J. ^{[2
]}

Hadjiyiannakou, K. ^{[2
]}

Jansen, K. ^{[4
]}

Koutsou, G. ^{[2
]}

Aviles-Casco, A. Vaquero ^{[5
]}

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 North 12th St, Philadelphia, PA 19122 USA

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

[5] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

来源：

PHYSICAL REVIEW D | 2019年 / 100卷 / 01期

基金：

美国国家科学基金会; 欧盟地平线“2020”;

关键词：

QUASI-ELASTIC SCATTERING; POLARIZED ELECTRONS; E'N)P;

D O I：

10.1103/PhysRevD.100.014509

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The electromagnetic form factors of the proton and the neutron are computed within lattice QCD using simulations with quark masses fixed to their physical values. Both connected and disconnected contributions are computed. We analyze two new ensembles of N-f = 2 and N-f = 2 + 1 + 1 twisted mass clover-improved fermions and determine the proton and neutron form factors, the electric and magnetic radii, and the magnetic moments. We use several values of the sink-source time separation in the range of 1.0 to 1.6 fm to ensure ground state identification. Disconnected contributions are calculated to an unprecedented accuracy at the physical point. Although they constitute a small correction, they are non-negligible and contribute up to 15% for the case of the neutron electric charge radius.

引用

页数：26

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