Exploring strange nucleon form factors on the lattice

被引：45

作者：

Babich, Ronald ^{[1
]}

Brower, Richard C. ^{[1
,2
]}

Clark, Michael A. ^{[3
]}

Fleming, George T. ^{[4
]}

Osborn, James C. ^{[5
]}

Rebbi, Claudio ^{[1
,2
]}

Schaich, David ^{[2
]}

机构：

[1] Boston Univ, Ctr Computat Sci, Boston, MA 02215 USA

[2] Boston Univ, Dept Phys, Boston, MA 02215 USA

[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[4] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[5] Argonne Leadership Comp Facil, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW D | 2012年 / 85卷 / 05期

关键词：

SIGMA-TERM; QUARK MASSES; QCD; PROTON; IMPROVEMENT; SCATTERING; LIGHT; SCALE;

D O I：

10.1103/PhysRevD.85.054510

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss techniques for evaluating sea quark contributions to hadronic form factors on the lattice and apply these to an exploratory calculation of the strange electromagnetic, axial, and scalar form factors of the nucleon. We employ the Wilson gauge and fermion actions on an anisotropic 24(3) x 64 lattice, probing a range of momentum transfer with Q(2) < 1 GeV2. The strange electric and magnetic form factors, G(E)(s)(Q(2)) and G(M)(s)(Q(2)), are found to be small and consistent with zero within the statistics of our calculation. The lattice data favor a small negative value for the strange axial form factor G(A)(s)(Q(2)) and exhibit a strong signal for the bare strange scalar matrix element < N vertical bar(s) over bars vertical bar N >(0). We discuss the unique systematic uncertainties affecting the latter quantity relative to the continuum, as well as prospects for improving future determinations with Wilson-like fermions.

引用

页数：15

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