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Title: Polarization measurement of the. sigma. /sup +/ produced in the line-reversed reactions. pi. /sup +/p. -->. K/sup +/. sigma. /sup +/ and K/sup -/p. -->. pi. /sup -/. sigma. /sup +/ at 7 and 11. 6 GeV/c

Abstract

The polarization of the ..sigma../sup +/ has been measured for the line-reversed reactions ..pi../sup +/p ..-->.. K/sup +/..sigma../sup +/ and K/sup -/p ..-->.. ..pi../sup -/..sigma../sup +/ at 7 and 11.6 GeV/c using the SLAC Hybrid Facility. Since the ..sigma../sup +/ decay is observed in the bubble chamber, the trigger of the flash lamps on a fast K/sup +/(..pi../sup +/) did not bias the polarization measurements. We find that the ..sigma../sup +/ polarizations from the two reactions have opposite signs but similar magnitude and are in much better agreement with the predictions of weak exchange degeneracy than previous lower-energy comparisons.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
The Blackett Laboratory, Imperial College, London SW7 2AZ, Great Britain
OSTI Identifier:
7208040
Resource Type:
Journal Article
Journal Name:
Phys. Rev. Lett.; (United States)
Additional Journal Information:
Journal Volume: 40:11
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; KAON MINUS-PROTON INTERACTIONS; EXCHANGE DEGENERACY; PARTICLE PRODUCTION; PION PLUS-PROTON INTERACTIONS; SIGMA PLUS; BUBBLE CHAMBERS; DECAY; GEV RANGE 01-10; GEV RANGE 10-100; KAONS PLUS; PIONS MINUS; POLARIZATION; BARYONS; BOSONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GAS TRACK DETECTORS; GEV RANGE; HADRON-HADRON INTERACTIONS; HADRONS; HYPERONS; INTERACTIONS; KAON-NUCLEON INTERACTIONS; KAON-PROTON INTERACTIONS; KAONS; MEASURING INSTRUMENTS; MESON-BARYON INTERACTIONS; MESON-NUCLEON INTERACTIONS; MESONS; PARTICLE INTERACTIONS; PION-NUCLEON INTERACTIONS; PION-PROTON INTERACTIONS; PIONS; PSEUDOSCALAR MESONS; RADIATION DETECTORS; SIGMA PARTICLES; STRANGE PARTICLES; 645104* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Meson-Induced Interactions- (-1987)

Citation Formats

Baker, P A, Chima, J S, Dornan, P J, Gibbs, D J, Hall, G, Miller, D B, Virdee, T S, White, A P, Ballam, J, Bouchez, J, Carroll, J T, Cautis, C V, Chadwick, G B, Chaloupka, V, Field, R C, Frettag, D R, Lewis, R A, Minard, M N, Moffeit, K C, and Stevens, R A. Polarization measurement of the. sigma. /sup +/ produced in the line-reversed reactions. pi. /sup +/p. -->. K/sup +/. sigma. /sup +/ and K/sup -/p. -->. pi. /sup -/. sigma. /sup +/ at 7 and 11. 6 GeV/c. United States: N. p., 1978. Web. doi:10.1103/PhysRevLett.40.678.
Baker, P A, Chima, J S, Dornan, P J, Gibbs, D J, Hall, G, Miller, D B, Virdee, T S, White, A P, Ballam, J, Bouchez, J, Carroll, J T, Cautis, C V, Chadwick, G B, Chaloupka, V, Field, R C, Frettag, D R, Lewis, R A, Minard, M N, Moffeit, K C, & Stevens, R A. Polarization measurement of the. sigma. /sup +/ produced in the line-reversed reactions. pi. /sup +/p. -->. K/sup +/. sigma. /sup +/ and K/sup -/p. -->. pi. /sup -/. sigma. /sup +/ at 7 and 11. 6 GeV/c. United States. https://doi.org/10.1103/PhysRevLett.40.678
Baker, P A, Chima, J S, Dornan, P J, Gibbs, D J, Hall, G, Miller, D B, Virdee, T S, White, A P, Ballam, J, Bouchez, J, Carroll, J T, Cautis, C V, Chadwick, G B, Chaloupka, V, Field, R C, Frettag, D R, Lewis, R A, Minard, M N, Moffeit, K C, and Stevens, R A. 1978. "Polarization measurement of the. sigma. /sup +/ produced in the line-reversed reactions. pi. /sup +/p. -->. K/sup +/. sigma. /sup +/ and K/sup -/p. -->. pi. /sup -/. sigma. /sup +/ at 7 and 11. 6 GeV/c". United States. https://doi.org/10.1103/PhysRevLett.40.678.
@article{osti_7208040,
title = {Polarization measurement of the. sigma. /sup +/ produced in the line-reversed reactions. pi. /sup +/p. -->. K/sup +/. sigma. /sup +/ and K/sup -/p. -->. pi. /sup -/. sigma. /sup +/ at 7 and 11. 6 GeV/c},
author = {Baker, P A and Chima, J S and Dornan, P J and Gibbs, D J and Hall, G and Miller, D B and Virdee, T S and White, A P and Ballam, J and Bouchez, J and Carroll, J T and Cautis, C V and Chadwick, G B and Chaloupka, V and Field, R C and Frettag, D R and Lewis, R A and Minard, M N and Moffeit, K C and Stevens, R A},
abstractNote = {The polarization of the ..sigma../sup +/ has been measured for the line-reversed reactions ..pi../sup +/p ..-->.. K/sup +/..sigma../sup +/ and K/sup -/p ..-->.. ..pi../sup -/..sigma../sup +/ at 7 and 11.6 GeV/c using the SLAC Hybrid Facility. Since the ..sigma../sup +/ decay is observed in the bubble chamber, the trigger of the flash lamps on a fast K/sup +/(..pi../sup +/) did not bias the polarization measurements. We find that the ..sigma../sup +/ polarizations from the two reactions have opposite signs but similar magnitude and are in much better agreement with the predictions of weak exchange degeneracy than previous lower-energy comparisons.},
doi = {10.1103/PhysRevLett.40.678},
url = {https://www.osti.gov/biblio/7208040}, journal = {Phys. Rev. Lett.; (United States)},
number = ,
volume = 40:11,
place = {United States},
year = {Mon Mar 13 00:00:00 EST 1978},
month = {Mon Mar 13 00:00:00 EST 1978}
}