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Phys. Rev. C 61, 025201 (2000) [19 pages]

Determination of the π±p⃗π±π+n cross section near threshold

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J. B. Lange*, A. Ambardar, F. Duncan†, A. Feltham, G. Hofman, R. R. Johnson, G. Jones, M. Pavan‡, K. J. Raywood, and D. Vetterli§
Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

J. T. Brack**, D. Ottewell, and G. R. Smith
TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia, Canada V6T 2A3

M. E. Sevior††
School of Physics, University of Melbourne, Parkville, Victoria 3052, Australia

Received 2 July 1999; published 13 January 2000

The total cross section for the π-p⃗π-π+n reaction has been measured at incident pion kinetic energies of 200, 190, 184, 180, and 176 MeV, and cross sections for the π+p⃗π+π+n reaction were obtained at 200 and 184 MeV. A fit of these cross sections by heavy baryon chiral perturbation theory yields values of 8.5±0.6(mπ-3) and 2.5±0.1(mπ-3) for the reaction matrix elements A10 and A32, and, for the s-wave isospin-0 and isospin-2 π-π scattering lengths, the values a0=0.23±0.08(mπ-1) and a2=-0.031±0.008(mπ-1), respectively.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.61.025201
DOI:
10.1103/PhysRevC.61.025201
PACS:
25.80.Ek, 13.60.Le, 13.75.Gx, 13.85.Hd

*Present address: Defense Research Establishment Ottawa, Nepean, Ontario Canada K1A 0Z4.

†Present address: Dept. of Physics, Queen’s University, Kingston, Ontario Canada K7L 3N6.

‡Present address: MIT, Cambridge, MA 02139.

§Present address: Inselspital—University of Bern, Division of Medical Radiation Physics, CH-3010 Bern, Switzerland.

**Present address: Dept. of Physics, University of Colorado at Boulder, Boulder, CO 80309-0390.

††Electronic address: msevior@physics.unimelb.edu.au

 
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