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Experimental test of exchange degeneracy in hypercharge exchange reactions at 7 and 11. 5 GeV/c. [Cross sections]

Conference ·
OSTI ID:6402503
; ;

The 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*(1385); K/sup -/p ..-->.. ..pi../sup -/Y*(1385) at two energies: 7 and 11.5 GeV/c were studied. The experiment was conducted in the SLAC 1 m rapid cycling bubble chamber triggered by electronic detectors and an online algorithm. The cross section excess for the K/sup -/ reactions which has shown exchange degeneracy violations at lower energy is still significant but smaller at 7 GeV/c. At 11.5 GeV/c it is found that both the helicity-flip and non-flip dominated processes are consistent with exchange degeneracy predictions. Polarization measurements of the ..sigma../sup +/ and Y* at both energies support dominance in the production process of exchange degenerate K*(890) vector and K*(1490) tensor trajectories. 9 references

Research Organization:
Imperial Coll. of Science and Technology, London (UK); Stanford Linear Accelerator Center, CA (USA)
DOE Contract Number:
EY-76-C-03-0515
OSTI ID:
6402503
Report Number(s):
SLAC-PUB-2169; IC/HEMP-78/21; CONF-780826-8
Country of Publication:
United States
Language:
English

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Experimental test of exchange degeneracy in hypercharge exchange reactions. [Helicity-flip and nonflip amplitudes, angular distribution, quark model]
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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
BARYON RESONANCES
BARYONS
BOSONS
CROSS SECTIONS
DECAY
ELEMENTARY PARTICLES
EXCHANGE DEGENERACY
EXCHANGE INTERACTIONS
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONIC PARTICLE DECAY
HADRONS
HELICITY
HYPERCHARGE
HYPERONS
INTERACTIONS
K RESONANCES
K-1420 RESONANCES
K-892 RESONANCES
KAON MINUS-PROTON INTERACTIONS
KAON-NUCLEON INTERACTIONS
KAON-PROTON INTERACTIONS
MESON RESONANCES
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
POLARIZATION
RESONANCE PARTICLES
SIGMA PARTICLES
SIGMA PLUS
SIGMA-1385 RESONANCES
STRANGE PARTICLES
TENSOR MESONS
VECTOR MESONS
Y RESONANCES