Role of the Δ isobar in the reaction NN→NNπ near threshold

被引：67
|
作者：
Hanhart, C [1 ]
Haidenbauer, J
Krehl, O
Speth, J
机构：
[1] Univ Bonn, Inst Theoret Kernphys, D-53115 Bonn, Germany
[2] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany
来源：
PHYSICS LETTERS B | 1998年 / 444卷 / 1-2期
关键词：
D O I：
10.1016/S0370-2693(98)01385-9
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A model calculation for pion production in nucleon-nucleon collisions is presented. Direct production, pion rescattering and contributions from pair diagrams are taken into account. The amplitudes for the elementary processes are based on well established microscopic models of nucleon-nucleon and pion-nucleon scattering. The Delta(1232) is included explicitly and is found to play an important role even at energies close to production threshold. A good overall agreement with existing data from the pion production threshold up to the Delta resonance region is achieved. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码：25 / 31
页数：7
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