Electromagnetic structure of light baryons in lattice QCD

被引：21

作者：

Duncan, A

Eichten, E

Thacker, H

机构：

[1] FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510

[2] UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901

来源：

PHYSICS LETTERS B | 1997年 / 409卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(97)00850-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A method for computing electromagnetic properties of hadrons in quenched lattice QCD is applied to the extraction of electromagnetic properties of the octet baryons. This allows a determination of the full dependence of the baryon masses on the charges and masses of the valence quarks. Results of a first numerical study (at beta = 5.7 with Wilson action and light quark masses fixed from the pseudoscalar meson spectrum) are reported. The quenched octet baryon isomultiplet splittings (with statistical errors) are found to be: N - P = 2.08(+/-0.56), Sigma(0) - Sigma(+) = 2.63(+/-0.39), Sigma(-) - Sigma(0) = 4.90(+/-0.36) and Xi(-) - Xi(0) = 5.58(+/-0.24) MeV. Estimates of the systematic electromagnetic corrections arising from finite volume are included in these results. (C) 1997 Elsevier Science B.V.

引用

页码：387 / 392

页数：6

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