S = -1 meson-baryon scattering in coupled-channel unitarized Chiral Perturbation Theory

被引：1
|
作者：
García-Recio, C [1 ]
Nieves, J
Arriola, ER
Vacas, MV
机构：
[1] Univ Granada, Dept Fis Moderna, E-18071 Granada, Spain
[2] Ctr Mixto Univ Valencia CSIC, Dept Fis Teor, E-46071 Valencia, Spain
[3] Ctr Mixto Univ Valencia CSIC, IFIC, E-46071 Valencia, Spain
来源：
EUROPEAN PHYSICAL JOURNAL A | 2003年 / 18卷 / 2-3期
关键词：
D O I：
10.1140/epja/i2002-10297-y
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：
The s-wave meson-baryon scattering amplitude is analyzed for the strangeness S = -1 and isospin I = 0 sector in a Bethe-Salpeter coupled-channel formalism incorporating Chiral Symmetry. Four two-body channels have been considered: (K) over barN, piSigma, etaLambda, KXi. The needed two-particle irreducible matrix amplitude is taken from lowest-order Chiral Perturbation Theory in a relativistic formalism. Off-shell behaviour is parameterized in terms of low-energy constants, which outnumber those assumed in previous works and provide a better fit to the data. The position of the complex poles in the second Riemann sheet of the scattering amplitude determines masses and widths of the Lambda(1405) and Lambda(1670) resonances which compare well with accepted numbers.
引用
收藏
页码：185 / 187
页数：3
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