PION LOOP CONTRIBUTION TO THE ELECTROMAGNETIC PION CHARGE RADIUS

被引：67

作者：

ALKOFER, R ^{[1
]}

BENDER, A ^{[1
]}

ROBERTS, CD ^{[1
]}

机构：

[1] ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 1995年 / 10卷 / 23期

关键词：

D O I：

10.1142/S0217751X95001601

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A phenomenological Dyson-Schwinger equation approach to QCD, formalized in terms of a QCD-based model field theory, is used to calculate the electromagnetic charge radius of the pion. The contributions from the core of dressed quarks and the pion loop are identified and compared. It is shown explicitly that the divergence of the charge radius in the chiral limit is due to the pion loop but that at m(pi) = 0.14 GeV this loop contributes less than 15% to (r(pi)(2)), i.e. the dressed quark core is the dominant determining characteristic for the pion.

引用

页码：3319 / 3342

页数：24

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