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Study of the reaction. pi. /sup -/p. --> pi. /sup 0/. pi. /sup 0/n at 25 GeV/c

Journal Article · · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)
OSTI ID:5372262
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The reaction ..pi../sup -/p..--> pi../sup 0/..pi../sup 0/n has been studied at momentum 25 GeV/c. The 648-channel hodoscopic spectrometer NICE was used for detection of the four ..gamma.. rays from decay of the ..pi../sup 0/ mesons. The D wave of the ..pi../sup 0/..pi../sup 0/ system agrees completely with the contribution of the f meson determined in ..pi../sup +/..pi../sup -/ experiments. On the basis of fit to the angular distributions, the intensity of the S wave of the ..pi../sup 0/..pi../sup 0/ system and the cosine of its phase shift relative to the known D wave have been determined. Argand diagrams are given for the S-wave amplitude with isospin I = 0 in the mass region 1000--1500 MeV. Two solutions are obtained. One of them exceeds the unitary limit for masses of the ..pi../sup 0/..pi../sup 0/ system above 1200 MeV. The other solution remains within the limits of unitarity and is almost elastic up to 1450 MeV. It indicates the existence of a resonance in the S/sub 0/ wave in the region of 1300 MeV (the Epsilon meson).
Research Organization:
Joint Experiment of the Institute of High Energy Physics, Serpukhov, USSR, and CERN, Geneva, Switzerland
OSTI ID:
5372262
Journal Information:
Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 41:2; ISSN SJNCA
Country of Publication:
United States
Language:
English

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Related Subjects

645104* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ARGAND DIAGRAMS
BARYONS
BOSONS
D WAVES
DIAGRAMS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
F-1260 RESONANCES
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESON RESONANCES
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NEUTRONS
NUCLEONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PHASE SHIFT
PION MINUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RESONANCE PARTICLES
S WAVES
SCATTERPLOTS
TENSOR MESONS