Crossing symmetry and phenomenological widths in effective Lagrangian models of the pion photoproduction process

被引：15

作者：

Fernandez-Ramirez, C. ^{[1
]}

de Guerra, E. Moya ^{[1
,2
]}

Udias, J. M. ^{[1
]}

机构：

[1] Univ Complutense Madrid, Fac Ciencias Fis, Grp Fis Nucl, Dept Fis Atom Mol & Nucl, E-28040 Madrid, Spain

[2] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain

来源：

PHYSICS LETTERS B | 2008年 / 660卷 / 03期

关键词：

crossing symmetry; phenomenological width; pion photoproduction;

D O I：

10.1016/j.physletb.2007.11.099

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the importance of crossing symmetry in effective field models and the effects of phenomenological nucleon resonance widths on the paradigmatic case of pion photoproduction. We use reaction models containing four star resonances up to 1.8 GeV (Delta(1232), N(1440), N(1520), N(1535), Delta(1620), N(1650), Delta(1700), and N(1720)) with different prescriptions for crossed terms and widths, to fit the latest world database on pion photoproduction. We compare chi(2) results from selected multipoles and fits. The chi(2) is highly dependent on the fulfillment of crossing symmetry and the inclusion of u channels. (C) 2008 Elsevier B.V. All rights reserved.

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收藏

页码：188 / 192

页数：5

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