Experimental test of exchange degeneracy in hypercharge exchange reactions. [Helicity-flip and nonflip amplitudes, angular distribution, quark model]
Two pairs of line-reversed reactions ..pi../sup +/P ..-->.. K/sup +/..sigma../sup +/, K/sup -/p ..-->.. ..pi../sup -/..sigma../sup +/ and ..pi../sup +/p ..-->.. K/sup +/Y*/sup +/(1385), K/sup -/p ..-->.. ..pi../sup -/Y*/sup +/(1385) provide an experimental test of exchange degeneracy in hypercharge exchange reactions. From their study it is concluded that in contrast to the lower energy data, the 11.5 results for the two pairs of reactions are consistent with exchange degeneracy predictions for both helicity-flip and nonflip amplitudes. The Y(1385) decay angular distributions indicate that the quark model and Stodolsky--Sakurai predictions are in agreement with the main features of the data. However, small violations are observed at small momentum transfer. While the Y(1385) vertex is helicity-flip dominated, the nonvanishing of T/sub 3/2 - 1/2/ and T/sub -3/2 1/2/ suggests some finite helicity nonflip contribution in the forward direction. 23 references. (JFP)
- Research Organization:
- Stanford Linear Accelerator Center, CA (USA)
- DOE Contract Number:
- EY-76-C-03-0515
- OSTI ID:
- 6420852
- Report Number(s):
- SLAC-PUB-2208; CONF-7809129-1; TRN: 79-011094
- Resource Relation:
- Conference: Seoul symposium on elementary particle physics, Keoul, Republic of Korea, 1 Sep 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
KAON MINUS-PROTON INTERACTIONS
EXCHANGE DEGENERACY
HYPERCHARGE
PION PLUS-PROTON INTERACTIONS
SIGMA-1385 RESONANCES
HADRONIC PARTICLE DECAY
ANGULAR DISTRIBUTION
DIFFERENTIAL CROSS SECTIONS
HELICITY
KAONS PLUS
PARTICLE PRODUCTION
PIONS MINUS
POLARIZATION
SCATTERING AMPLITUDES
SIGMA PLUS
AMPLITUDES
BARYON RESONANCES
BARYONS
BOSONS
CROSS SECTIONS
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INTERACTIONS
KAON-NUCLEON INTERACTIONS
KAON-PROTON INTERACTIONS
KAONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PSEUDOSCALAR MESONS
RESONANCE PARTICLES
SIGMA PARTICLES
STRANGE PARTICLES
Y RESONANCES
645206* - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions
Baryon No. = 1- (-1987)