EFFECT OF THE N-DELTA INTERACTION ON OBSERVABLES OF THE PI-NN AND GAMMA-NN SYSTEMS

被引:28
|
作者
PENA, MT
GARCILAZO, H
OELFKE, U
SAUER, PU
机构
[1] UNIV HANOVER, W-3000 HANNOVER, GERMANY
[2] TRIUMF, VANCOUVER V6T 2A3, BC, CANADA
[3] UNIV WASHINGTON, DEPT PHYS, NUCL THEORY GRP, SEATTLE, WA 98195 USA
来源
PHYSICAL REVIEW C | 1992年 / 45卷 / 04期
关键词
D O I
10.1103/PhysRevC.45.1487
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
Effects on the hadronic and electromagnetic properties of the two-nucleon system above pion threshold, arising from the interaction of the DELTA-isobar with nucleons, are investigated. The instantaneous nucleon-DELTA potential is based on the meson exchange. Two-body reactions connecting channels with at most one pion and one photon are studied. Processes leading to a three-body pion-two-nucleon final state are considered in the restricted kinematic domain in which the pion forms the P33 resonance with one of the nucleons. The nucleon-DELTA potential is seen to increase the relative importance of the inelastic strength of two-nucleon spin-triplet states with respect to spin-singlet states, correcting a deficiency common in most existing models. Theoretical predictions are compared with recent experimental data for the various reactions. In particular, the differential cross section and the proton beam asymmetry for pp --> n-DELTA++ (p-pi+) are calculated, the latter observable being especially sensitive to the nucleon-DELTA interaction.
引用
收藏
页码:1487 / 1511
页数:25
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