APS » PROLA » Phys. Rev. Lett. » Volume 72 » Issue 8

Phys. Rev. Lett. 72, 1156 - 1159 (1994)

Reaction π+p→π+π0p near threshold and chiral symmetry breaking
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D. Počanić, E. Frlež, K. A. Assamagan, J. P. Chen, K. J. Keeter, R. M. Marshall, R. C. Minehart, and L. C. Smith
Department of Physics, University of Virginia, Charlottesville, Virginia 22901

G. E. Dodge, S. S. Hanna, and B. H. King
Department of Physics, Stanford University, Stanford, California 94305

J. N. Knudson
Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Received 9 June 1993

We have measured total cross sections for the reaction π+p→π+π-p 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, ξ=-0.25±0.10, in a global constrained fit of the five ππN near-threshold amplitudes. Consequently, we report new soft pion model values for the s-wave ππ scattering lengths.


©1994 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v72/p1156
DOI: 10.1103/PhysRevLett.72.1156
PACS: 13.75.Gx, 11.30.Rd

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