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 00:00:00 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), Vol. 72:8; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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