Nucleon form factors and moments of generalized parton distributions using Nf=2+1+1 twisted mass fermions

被引：91

作者：

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

Constantinou, M. ^{[1
]}

Dinter, S. ^{[3
]}

Drach, V. ^{[3
]}

Jansen, K. ^{[1
,3
]}

Kallidonis, C. ^{[1
]}

Koutsou, G. ^{[2
]}

机构：

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

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

[3] DESY, NIC, D-15738 Zeuthen, Germany

来源：

PHYSICAL REVIEW D | 2013年 / 88卷 / 01期

关键词：

SINGLET QCD ANALYSIS; NONPERTURBATIVE RENORMALIZATION; LATTICE; SCATTERING; OPERATORS; SPIN;

D O I：

10.1103/PhysRevD.88.014509

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results on the axial and the electromagnetic form factors of the nucleon, as well as on the first moments of the nucleon generalized parton distributions using maximally twisted mass fermions. We analyze two N-f = 2 + 1 + 1 ensembles having pion masses of 213 MeVand 373 MeVeach at a different value of the lattice spacing. The lattice scale is determined using the nucleon mass computed on a total of 17 N-f = 2 + 1 + 1 ensembles generated at three values of the lattice spacing, a. The renormalization constants are evaluated nonperturbatively with a perturbative subtraction of O(a(2)) terms. The moments of the generalized parton distributions are given in the (MS) over bar scheme at a scale of mu = 2 GeV. We compare with recent results obtained using different discretization schemes. The implications on the spin content of the nucleon are also discussed.

引用

页数：22

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