Measurement of the near-threshold H(. pi. sup + ,. pi. sup +. pi. sup + ) n cross section and chiral symmetry

Journal Article · Mon May 20 04:00:00 EDT 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.2569· OSTI ID:5677361

Sevior, M E; Ambardar, A; Brack, J T; Camerini, P; Duncan, F; Ernst, J; Feltham, A; Grion, N; Johnson, R R; Koch, G; Meirav, O; Ottewell, D F; Rui, R; Smith, G R; Sossi, V; Theis, D; Vetterliz, D ^[1]

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1. University of British Columbia, Vancouver, British Columbia Canada V6T 2W5 (CA) Universitaet Bonn, D-5300 Bonn 1, Germany TRIUMF, Vancouver, Canada V6T 2A6 Dipartimento di Fisica dell' Universita di Trieste, Trieste, Italy Istituto Nazionale di Fisica Nuclear, 34127 Trieste, Italy

Total cross sections for the H({pi}{sup +},{pi}{sup +}{pi}{sup +}){ital n} reaction have been measured at pion kinetic energies of 180, 184, 190 and 200 MeV. The threshold value for the matrix element {ital a}({pi}{sup +}{pi}{sup +}) and the {ital s}-wave, isospin-2, {pi}{pi} scattering length {ital a}{sub 2}{sup 0} were determined. The results were found to be in agreement with chiral perturbation theory and inconsistent with the model of dominance by quark loop anomalies.

• OSTI ID: 5677361
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:20; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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651220* -- Nuclear Properties & Reactions
A=1-5
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
CHARGED-PARTICLE REACTIONS
CHIRAL SYMMETRY
CROSS SECTIONS
DATA
DIMENSIONS
ENERGY RANGE
EXPERIMENTAL DATA
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HYDROGEN 1 TARGET
INELASTIC SCATTERING
INFORMATION
INTERACTIONS
LENGTH
MATRIX ELEMENTS
MESON REACTIONS
MESON-MESON INTERACTIONS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MONTE CARLO METHOD
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PION PLUS REACTIONS
PION REACTIONS
PION-PION INTERACTIONS
SCATTERING
SCATTERING AMPLITUDES
SCATTERING LENGTHS
SYMMETRY
TARGETS
TOTAL CROSS SECTIONS