REACTION PI(+)P-]PI(+)PI(0)P NEAR-THRESHOLD AND CHIRAL-SYMMETRY BREAKING

被引：30

作者：

POCANIC, D

FRLEZ, E

ASSAMAGAN, KA

CHEN, JP

KEETER, KJ

MARSHALL, RM

MINEHART, RC

SMITH, LC

DODGE, GE

HANNA, SS

KING, BH

KNUDSON, JN

机构：

[1] STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305

[2] LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 72卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.72.1156

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured total cross sections for the reaction pi+p --> pi+pi 0p at incident pion kinetic energies of 190, 200, 220, 240, and 260 MeV. We use this result to deduce a new value of the chiral symmetry breaking parameter, xi = -0.25 +/- 0.10, in a global constrained fit of the five pi pi N near-threshold amplitudes. Consequently, we report new soft pion model values for the s-wave pi pi scattering lengths.

引用

页码：1156 / 1159

页数：4

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