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
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
收藏
页码:1156 / 1159
页数:4
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