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

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...

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Veröffentlicht in:	Physical review letters 1991-05, Vol.66 (20), p.2569-2572
Hauptverfasser:	SEVIOR, M. E, AMBARDAR, A, MEIRAV, O, OTTEWELL, D. F, RUI, R, SMITH, G. R, SOSSI, V, THEIS, D, VETTERLI, D, BRACK, J. T, CAMERINI, P, DUNCAN, F, ERNST, J, FELTHAM, A, GRION, N, JOHNSON, R. R, KOCH, G
Format:	Artikel
Sprache:	eng
Schlagworte:	645103 > High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties 645300 > High Energy Physics-- Particle Invariance Principles & Symmetries AMPLITUDES CHARGED-PARTICLE REACTIONS CHIRAL SYMMETRY CROSS SECTIONS DATA DIMENSIONS ENERGY RANGE Exact sciences and technology EXPERIMENTAL DATA HADRON REACTIONS HADRON-HADRON INTERACTIONS Hadron-induced low- and intermediate-energy reactions and scattering (energy ≤ 10 gev) 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 PHYSICS AND RADIATION PHYSICS NUCLEAR REACTIONS NUMERICAL DATA PARTICLE INTERACTIONS Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PION PLUS REACTIONS PION REACTIONS PION-PION INTERACTIONS SCATTERING SCATTERING AMPLITUDES SCATTERING LENGTHS Specific reactions and phenomenology SYMMETRY TARGETS 651220 > Nuclear Properties & Reactions, A=1-5, Experimental The physics of elementary particles and fields TOTAL CROSS SECTIONS
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Zusammenfassung:	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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.66.2569