Cusps in K→3π decays

被引：115

作者：

Colangelo, G.

Gasser, J.

Kubis, B.

Rusetsky, A.

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[2] Univ Bern, Inst Theoret Phys, CH-3012 Bern, Switzerland

来源：

PHYSICS LETTERS B | 2006年 / 638卷 / 2-3期

关键词：

chiral symmetries; analytic properties of the S-matrix; decays of K-mesons; meson-meson interactions;

D O I：

10.1016/j.physletb.2006.05.017

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The pion mass difference generates a pronounced cusp in K -> 3 pi decays. As has recently been pointed out by Cabibbo and Isidori, an accurate measurement of the cusp may allow one to pin down the S-wave pi pi scattering lengths to high precision. Here, we present and illustrate an effective field theory framework that allows one to determine the structure of this cusp in a straightforward manner. The strictures imposed by analyticity and unitarity are respected automatically. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：187 / 194

页数：8

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