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Experimental test of exchange degeneracy in hypercharge exchange reactions. [Helicity-flip and nonflip amplitudes, angular distribution, quark model]

Conference ·
OSTI ID:6420852

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
Country of Publication:
United States
Language:
English

Similar Records

Experimental test of exchange degeneracy in hypercharge exchange reactions at 7 and 11. 5 GeV/c. [Cross sections]
Conference · Sat Jul 01 00:00:00 EDT 1978 · OSTI ID:6402503
Amplitude analysis of Y*(1385) production in the line-reversed reactions:. pi. /sup +/p. -->. K/sup +/Y*(1385) and K/sup -/p. -->. pi. /sup -/Y*(1385) at 7 and 11. 5 GeV/c. [Sigma(1385). -->. lambda pi. ,. lambda. -->. p. pi. /sup -/, angular distribution, helicity--flip and non-flip]
Conference · Tue Aug 01 00:00:00 EDT 1978 · OSTI ID:6228596
Confirmation of exchange-degeneracy predictions in the line-reversed reactions:. pi. /sup +/p. -->. K/sup +/Y* (1385) and K/sup -/p. -->. pi. /sup -/Y* (1385) at 11. 5 GeV/c
Journal Article · Mon Sep 04 00:00:00 EDT 1978 · Phys. Rev. Lett.; (United States) · OSTI ID:6615407

Related Subjects

645206* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. = 1-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANGULAR DISTRIBUTION
BARYON RESONANCES
BARYONS
BOSONS
CROSS SECTIONS
DECAY
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
EXCHANGE DEGENERACY
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONIC PARTICLE DECAY
HADRONS
HELICITY
HYPERCHARGE
HYPERONS
INTERACTIONS
KAON MINUS-PROTON INTERACTIONS
KAON-NUCLEON INTERACTIONS
KAON-PROTON INTERACTIONS
KAONS
KAONS PLUS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PION PLUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PIONS MINUS
POLARIZATION
PSEUDOSCALAR MESONS
RESONANCE PARTICLES
SCATTERING AMPLITUDES
SIGMA PARTICLES
SIGMA PLUS
SIGMA-1385 RESONANCES
STRANGE PARTICLES
Y RESONANCES