Nucleon strangeness form factors from Nf=2+1 clover fermion lattice QCD

被引：60

作者：

Doi, Takumi ^{[3
]}

Deka, Mridupawan ^{[3
]}

Dong, Shao-Jing ^{[3
]}

Draper, Terrence ^{[3
]}

Liu, Keh-Fei ^{[3
]}

Mankame, Devdatta ^{[3
]}

Mathur, Nilmani ^{[1
]}

Streuer, Thomas ^{[2
]}

机构：

[1] Tata Inst Fundamental Res, Dept Theoret Phys, Bombay 40005, Maharashtra, India

[2] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[3] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 09期

关键词：

MAGNETIC-MOMENT; LOOPS;

D O I：

10.1103/PhysRevD.80.094503

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the N-f=2+1 clover fermion lattice QCD calculation of the nucleon strangeness form factors. We evaluate disconnected insertions using the Z(4) stochastic method, along with unbiased subtractions from the hopping parameter expansion. We find that increasing the number of nucleon sources for each configuration improves the signal significantly. We obtain G(M)(s)(0)=-0.017(25)(07), where the first error is statistical, and the second is the uncertainties in Q(2) and chiral extrapolations. This is consistent with experimental values, and has an order of magnitude smaller error.

引用

页数：6

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