Unitary isobar model-MAID2007

被引：438

作者：

Drechsel, D.

Kamalov, S. S.

Tiator, L. ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[2] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

来源：

EUROPEAN PHYSICAL JOURNAL A | 2007年 / 34卷 / 01期

关键词：

D O I：

10.1140/epja/i2007-10490-6

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：

The unitary isobar model MAID2007 has been developed to analyze the world data of pion photo- and electroproduction. The model contains both a common background and several resonance terms. The background is unitarized according to the K-matrix prescription, and the 13 four-star resonances with masses below 2GeV are described by appropriately unitarized Breit-Wigner forms. The data have been analyzed by both single-energy and global fits, and the transverse and longitudinal helicity amplitudes have been extracted for the four-star resonances below 2GeV. Because of its inherent simplicity, MAID2007 is well adopted for predictions and analysis of the observables in pion photo- and electroproduction.

引用

页码：69 / 97

页数：29

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