Dispersion-theoretical analysis of the nucleon electromagnetic form factors: Inclusion of time-like data

被引：96

作者：

Hammer, HW ^{[1
]}

Meissner, UG ^{[1
]}

Drechsel, D ^{[1
]}

机构：

[1] UNIV BONN, INST THEORET KERNPHYS, D-53115 BONN, GERMANY

来源：

PHYSICS LETTERS B | 1996年 / 385卷 / 1-4期

关键词：

D O I：

10.1016/0370-2693(96)00865-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We update a recent dispersion-theoretical fit to the nucleon electromagnetic form factors by including the existing data in the time-like region. We show that while the time-like data for the proton can be described consistently with the existing world space-like data, this is not the case for the neutron. Another measurement of the process e(+)e(-) --> <(n)over bar n> is called for. We furthermore sharpen the previous estimate of the separation between the perturbative and the non-perturbative regime, which is characterized by a scale parameter Lambda(2) similar or equal to 10 GeV2.

引用

页码：343 / 347

页数：5

共 25 条

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