Comments on the σ and κ

被引：67

作者：

Bugg, DV ^{[1
]}

机构：

[1] Queen Mary Univ London, London E1 4NS, England

来源：

PHYSICS LETTERS B | 2003年 / 572卷 / 1-2期

关键词：

D O I：

10.1016/j.physletb.2003.07.078

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Evidence for the a pole has been reported in production processes such as D+ --> pi(+)pi(-)pi(+); likewise evidence for the K pole appears in D+ --> K(-)pi(+)pi(+). Their effects in pipi and Kpi elastic scattering are much less conspicuous. However, consistent fits to both production data and elastic scattering may be obtained by including the Adler zero into an s-dependent width for each resonance. These zeros suppress strongly the effects of the sigma and kappa poles in elastic scattering; the zeros are absent from amplitudes for production data. With this prescription, data from pipi --> pipi, K(e)4 decays and CP violation in K-0 decays give a sigma pole position of (525 +/- 40)-i(247 +/- 25) MeV. A combined analysis with production data gives a better determination of (533 +/- 25)-i(249 +/- 25) MeV. The analysis of LASS data for Kpi elastic scattering, including the Adler zero, determines a kappa pole at (722 +/- 60) -i(386 50) MeV. The Fourier transform of the matrix element for sigma --> pipi reveals a compact interaction region with RMS radius similar to0.4 fm. (C) 2003 Published by Elsevier B.V.

引用

页码：1 / 7

页数：7

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