NN→NN π+ reaction near threshold in a chiral power counting approach -: art. no. 034613

被引:35
作者
da Rocha, CA
Miller, GA
van Kolck, U
机构
[1] Univ Estadual Paulista, Inst Fis Teor, BR-01405900 Sao Paulo, Brazil
[2] Univ Sao Judas Tadeu, Dept Desenvolvimento Tecnol, BR-03166000 Sao Paulo, Brazil
[3] Univ Washington, Dept Phys, Seattle, WA 98195 USA
[4] CALTECH, Kellogg Radiat Lab, Pasadena, CA 91125 USA
来源
PHYSICAL REVIEW C | 2000年 / 61卷 / 03期
关键词
D O I
10.1103/PhysRevC.61.034613
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
Power-counting arguments are used to organize the interactions contributing to the NN-->d pi,pn pi reactions near threshold. We estimate the contributions from the three formally leading mechanisms: the Weinberg-Tomozawa (WT) term, the impulse term, and the Delta-excitation mechanism. Subleading but potentially large mechanisms, including S-wave pion rescattering, the Galilean correction to the WT term, and short-ranged contributions are also examined. The WT term is shown to be numerically the largest, and the other contributions are found to approximately cancel. Similarly to the reaction pp-->pp pi(0), the computed cross sections are considerably smaller than the data. We discuss possible origins of this discrepancy.
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页数:12
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