Nucleon axial form factors using Nf=2 twisted mass fermions with a physical value of the pion mass

被引：86

作者：

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

Constantinou, M. ^{[3
]}

Hadjiyiannakou, K. ^{[2
]}

Jansen, K. ^{[4
]}

Kallidonis, C. ^{[2
]}

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, 1925 N 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 | 2017年 / 96卷 / 05期

关键词：

LATTICE QCD; NONPERTURBATIVE RENORMALIZATION; PHASE-STRUCTURE; QUARKS; DECAY;

D O I：

10.1103/PhysRevD.96.054507

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results on the nucleon axial and induced pseudoscalar form factors using an ensemble of two degenerate twisted mass clover-improved fermions with mass yielding a pion mass of m(pi) = 130 MeV. We evaluate the isovector and the isoscalar, as well as the strange and the charm axial form factors. The disconnected contributions are evaluated using recently developed methods that include deflation of the lower eigenstates, allowing us to extract the isoscalar, strange, and charm axial form factors. We find that the disconnected quark loop contributions are nonzero and particularly large for the induced pseudoscalar form factor.

引用

页数：24

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