Document Type
Article
Publication Date
9-1-1991
Abstract
Total cross sections, angular, and mass distributions for the reaction π-p→π0π0n have been measured for pπ-(lab)=7–140 MeV/c above threshold. The threshold amplitude was used to determine a value for the chiral-symmetry-breaking parameter, ξ, of -0.98±0.52. The ππ scattering lengths aI for isospin I=0 and 2 are derived from this result, together with a current-algebra sum rule. The results are a0=(0.207±0.028)mπ-1 and a2=(-0.022±0.011)mπ-1. These values are consistent with chiral symmetry broken by the Weinberg ππ interaction and the effects of the f0(975) scalar meson.
Publication Title
Physical Review C
Rights
©1991 American Physical Society
Recommended Citation
J. Lowe, B. Bassalleck, H. Burkhardt, W. J. Fickinger, J. R. Hall, M. D. Hasinoff, D. Horvath, G. Koch, K. D. Larson, J. P. Miller, A.J. Noble, B. L. Roberts, D. K. Robinson, M. Sakitt, M. E. Sevior, N. W. Tanner, C. E. Waltham, T. M. Warner, and D. M. Wolfe. π− p→π0π0n near threshold and chiral symmetry breaking. Phys. Rev. C 44, 956, 1 September 1991