Isovector axial form factors of the nucleon in two-flavor lattice QCD

被引：50

作者：

Capitani, S. ^{[1
,2
,3
,4
]}

Della Morte, M. ^{[5
]}

Djukanovic, D. ^{[1
,2
,3
]}

von Hippel, G. M. ^{[1
,2
]}

Hua, J. ^{[1
,2
,3
]}

Jager, B. ^{[5
,6
,7
]}

Junnarkar, P. M. ^{[3
,8
]}

Meyer, H. B. ^{[1
,2
,3
]}

Rae, T. D. ^{[1
,2
]}

Wittig, H. ^{[1
,2
,3
]}

机构：

[1] Johannes Gutenberg Univ Mainz, PRISMA Cluster Excellence, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany

[2] Johannes Gutenberg Univ Mainz, Inst Kernphys, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany

[3] Johannes Gutenberg Univ Mainz, Helmholtz Inst Mainz, D-55099 Mainz, Germany

[4] Goethe Univ Frankfurt, Inst Theoret Phys, Max von Laue Str 1, D-60438 Frankfurt, Germany

[5] Univ Southern Denmark, CP3 Origins & Danish IAS, Campusvej 55, DK-5230 Odense M, Denmark

[6] Swansea Univ, Coll Sci, Dept Phys, Swansea SA2 8PP, W Glam, Wales

[7] Swiss Fed Inst Technol, Inst Theoret Phys, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland

[8] Tata Inst Fundamental Res, Mumbai 400005, Maharashtra, India

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2019年 / 34卷 / 02期

基金：

瑞士国家科学基金会; 新加坡国家研究基金会;

关键词：

Nucleon form factors; nucleon axial charge; lattice QCD; MUON-CAPTURE; DECAY; MASS;

D O I：

10.1142/S0217751X1950009X

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We present a lattice calculation of the nucleon isovector axial and induced pseudoscalar form factors on the CLS ensembles using N-f = 2 dynamical flavors of nonperturbatively O(a)-improved Wilson fermions and anO(a)-improved axial current together with the pseudoscalar density. Excited-state effects in the extraction of the form factors are treated using a variety of methods, with a detailed discussion of their respective merits. The chiral and continuum extrapolation of the results is performed both using formulae inspired by Heavy Baryon Chiral Perturbation Theory (HBChPT) and a global approach to the form factors based on a chiral effective field theory (EFT) including axial vector mesons. Our results indicate that careful treatment of excited-state effects is important in order to obtain reliable results for the axial form factors of the nucleon, and that the main remaining error stems from the systematic uncertainties of the chiral extrapolation. As final results, we quote g(A) = 1.278 +/- 0.0681(-0.087),(+0.000)< r(A)(2)> = 0.360 +/- 0.036(-0)(,0)(88)(+0.080)fm(2), and gp = 7.7 +/- 1.8(-2.0)(+)(0.8) for the axial charge, axial charge radius and induced pseudoscalar charge, respectively, where the first error is statistical and the second is systematic.

引用

页数：37

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