An isobar model for η photo- and electroproduction on the nucleon

被引：161

作者：

Chiang, WT ^{[1
]}

Yang, SN

Tiator, L

Drechsel, D

机构：

[1] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

[2] Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

来源：

NUCLEAR PHYSICS A | 2002年 / 700卷 / 1-2期

关键词：

eta meson; photoproduction; electroproduction; isobar model; nucleon resonances;

D O I：

10.1016/S0375-9474(01)01325-2

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：

Eta photo- and electroproduction on the nucleon is studied using an isobar model. The model contains Born terms, and contributions from vector-meson exchanges and nucleon resonances. Our results are compared with recent eta-photoproduction data for differential and total cross sections, beam asymmetry, and target asymmetry, as well as electroproduction data. Besides the dominant S-11(1535) resonance, we show that the second S-11 resonance, S-11(1650), is also necessary to be included in order to extract S-11(1535) resonance parameters properly. In addition, the beam asymmetry data allow us to extract very small (< 0.1%) N* --> etaN decay branching ratios of the D-13(1520) and F-15(1680) resonances because of the overwhelming s-wave dominance. This model (ETA-MAID) is implemented as a part of the MAID program (the MAID program can be accessed from the webpage: http://www.kph.uni-mainz.de/MAID/maid.html). (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：429 / 453

页数：25

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