LOW-ENERGY PION-PION PARAMETERS FROM FORWARD DISPERSION RELATIONS

被引：42

作者：

MORGAN, D

SHAW, G

机构：

[1] Rutherford High Energy Laboratory, Chilton, Didcot, Berkshire England

来源：

NUCLEAR PHYSICS B | 1969年 / B 10卷 / 02期

关键词：

D O I：

10.1016/0550-3213(69)90115-1

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Values of the ππ scattering lengths and low-energy phase shifts are tabulated corresponding to various assumptions on the mass and width of the sigma meson. The method uses forward and first derivative dispersion relations. The I = 0 S-wave scattering length ao comes out in the range -0.3 to 0.6 mπ-1. The P-and D-wave scattering lengths are relatively independent of the sigma parameters. Solutions are compared with results on Ke4 decay and with the predictions of current algebra. Super broad sigmas seem to be preferred. Such solutions are also more self consistent in a bootstrap sense. © 1969.

引用

页码：261 / &