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pi. sup minus p r arrow. pi. sup 0. pi. sup 0 n near threshold and chiral symmetry breaking

Journal Article · · Physical Review, C (Nuclear Physics); (United States)
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  1. University of Birmingham; Birmingham; B152TT; United Kingdom Boston University; Boston; Massachusetts (USA) University of British Columbia; Vancouver; British Columbia (Canada) Brookhaven National Laboratory; Upton; New York (USA) Case Western Reserve University; Cleveland; Ohio (USA) Central Research Institute for Physics; Budapest (Hungary) University of New Mexico; Albuquerque; New Mexico (USA) University of Nottingham; Nottingham; NG72RD; United Kingdom Oxford University; Oxford; OX13RH; United Kingdom TRIUMF; Vancouver; British Columbia; Canada
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Total cross sections, angular, and mass distributions for the reaction {pi}{sup {minus}}{ital p}{r arrow}{pi}{sup 0}{pi}{sup 0}{ital n} have been measured for {ital p}{sub {pi}}{sup {minus}}(lab)=7--140 MeV/{ital c} above threshold. The threshold amplitude was used to determine a value for the chiral-symmetry-breaking parameter, {xi}, of {minus}0.98{plus minus}0.52. The {pi}{pi} scattering lengths {ital a}{sub {ital I}} for isospin {ital I}=0 and 2 are derived from this result, together with a current-algebra sum rule. The results are {ital a}{sub 0}=(0.207{plus minus}0.028){ital m}{sub {pi}}{sup {minus}1} and {ital a}{sub 2}=({minus}0.022{plus minus}0.011){ital m}{sub {pi}}{sup {minus}1}. These values are consistent with chiral symmetry broken by the Weinberg {pi}{pi} interaction and the effects of the {ital f}{sub 0}(975) scalar meson.
OSTI ID:
5099898
Journal Information:
Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:3; ISSN 0556-2813; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

645300 -- High Energy Physics-- Particle Invariance Principles & Symmetries
645400 -- High Energy Physics-- Field Theory
651220* -- Nuclear Properties & Reactions
A=1-5
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
BARYONS
BOSONS
BROOKHAVEN AGS
CHARGED-PARTICLE REACTIONS
CHIRAL SYMMETRY
CURRENT ALGEBRA
CYCLIC ACCELERATORS
DIMENSIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
EQUATIONS
F0-975 MESONS
FERMIONS
FIELD THEORIES
GAMMA RADIATION
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
HYDROGEN 1 TARGET
INTERACTIONS
IONIZING RADIATIONS
ISOSPIN
LENGTH
MESON REACTIONS
MESON-MESON INTERACTIONS
MESONS
MEV RANGE
NEUTRONS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PION MINUS REACTIONS
PION REACTIONS
PION-PION INTERACTIONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
RADIATIONS
SCALAR MESONS
SCATTERING LENGTHS
SUM RULES
SYMMETRY
SYMMETRY BREAKING
SYNCHROTRONS
TARGETS
THRESHOLD ENERGY