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Pure sea-quark contributions to the magnetic form factors of Sigma baryons
王平(理); Wang, P; Leinweber, DB; Thomas, AW
2015
发表期刊PHYSICAL REVIEW D
卷号92期号:3页码:34508
通讯作者王平(理)
文章类型Article
摘要We propose the pure sea-quark contributions to the magnetic form factors of Sigma baryons, G(Sigma-)(u) and G(Sigma+)(d), as priority observables for the examination of sea-quark contributions to baryon structure, both in present lattice QCD simulations and possible future experimental measurement. G(Sigma-)(u), the u-quark contribution to the magnetic form factor of Sigma(-), and G(Sigma+)(d), the d-quark contribution to the magnetic form factor of Sigma(+), are similar to the strange-quark contribution to the magnetic form factor of the nucleon, but promise to be larger by an order of magnitude. We explore the size of this quantity within chiral effective field theory, including both octet and decuplet intermediate states. The finite range regularization approach is applied to deal with ultraviolet divergences. Drawing on an established connection between quenched and full QCD, this approach makes it possible to predict the sea-quark contribution to the magnetic form factor purely from the meson loop. In the familiar convention where the quark charge is set to unity G(Sigma-)(u) = G(Sigma+)(d). We find a value of -0.38(-0.17)(+0.16) mu N, which is about seven times larger than the strange magnetic moment of the nucleon found in the same approach. Including quark charge factors, the u-quark contribution to the Sigma(-) magnetic moment exceeds the strange-quark contribution to the nucleon magnetic moment by a factor of 14.
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.92.034508
收录类别SCI
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000359488300006
引用统计
被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228664
专题理论物理室
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Wang P,Wang, P,Leinweber, DB,et al. Pure sea-quark contributions to the magnetic form factors of Sigma baryons[J]. PHYSICAL REVIEW D,2015,92(3):34508.
APA 王平,Wang, P,Leinweber, DB,&Thomas, AW.(2015).Pure sea-quark contributions to the magnetic form factors of Sigma baryons.PHYSICAL REVIEW D,92(3),34508.
MLA 王平,et al."Pure sea-quark contributions to the magnetic form factors of Sigma baryons".PHYSICAL REVIEW D 92.3(2015):34508.
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