Reaction [pi][sup +][ital p][r arrow][pi][sup +][pi][sup 0][ital p] near threshold and chiral symmetry breaking

Journal Article · Mon Feb 21 04:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.1156· OSTI ID:5010445

Pocanic, D; Frlez, E; Assamagan, K A; Chen, J P; Keeter, K J; Marshall, R M; Minehart, R C; Smith, L C ^[1]; Dodge, G E; Hanna, S S; King, B H ^[2]; Knudson, J N ^[3]

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1. Department of Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
2. Department of Physics, Stanford University, Stanford, California 94305 (United States)
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

We have measured total cross sections for the reaction [pi][sup +][ital p][r arrow][pi][sup +][pi][sup [minus]][ital 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, [xi]=[minus]0.25[plus minus]0.10, in a global constrained fit of the five [pi][pi][ital N] near-threshold amplitudes. Consequently, we report new soft pion model values for the [ital s]-wave [pi][pi] scattering lengths.

• OSTI ID: 5010445
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:8; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662340* -- Hadron Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BOSONS
CHIRAL SYMMETRY
CROSS SECTIONS
DIMENSIONS
ELEMENTARY PARTICLES
ENERGY
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
KINETIC ENERGY
LENGTH
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NUCLEONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PION PLUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PIONS NEUTRAL
PIONS PLUS
PROTONS
PSEUDOSCALAR MESONS
S WAVES
SCATTERING LENGTHS
SYMMETRY
SYMMETRY BREAKING
TOTAL CROSS SECTIONS