ORIGIN OF SU(2)-FLAVOR-SYMMETRY BREAKING IN ANTIQUARK DISTRIBUTIONS

被引：112

作者：

KUMANO, S ^{[1
]}

LONDERGAN, JT ^{[1
]}

机构：

[1] INDIANA UNIV,CTR NUCL THEORY,BLOOMINGTON,IN 47408

来源：

PHYSICAL REVIEW D | 1991年 / 44卷 / 03期

关键词：

D O I：

10.1103/PhysRevD.44.717

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The New Muon Collaboration has recently measured the electromagnetic structure functions F2 through deep-inelastic muon scattering from protons and deuterons. Structure functions [F2ep(x) - F2en(x)] have been measured to very small Bjorken x. The results seem to violate the Gottfried sum rule. We discuss various possible reasons for this result, including significant contributions from valence quarks at very small x and SU(2)-flavor breaking in the sea. We show that the pionic contribution to the sea-quark distributions gives qualitative agreement with estimates of the SU(2)-flavor-breaking contribution. We discuss various experiments which could give a direct measurement of uBAR-dBAR. We make qualitative estimates of shadowing effects in the deuteron and their impact on the extracted neutron structure functions.

引用

页码：717 / 724

页数：8

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