MEASUREMENT OF THE SIGMA- POLARIZATION IN THE REACTION pi- + p-->SIGMA- + K+

Journal Article · Sun Oct 01 00:00:00 EDT 1967 · Physical Review

OSTI ID:932538

Weldon, D; Steiner, H; Shapiro, G; Schultz, C; Johnson, C H; Holloway, L; Hansroul, M; Grannis, P; Dieterle, B; Chamberlain, O; Arens, J

The average polarization of the {Sigma}{sup -} produced in the reaction {pi}{sup -} + p {yields} {Sigma}{sup -} + K{sup +} has been measured between center-of-mass angles 134{sup o} and 166{sup o} for an incident {pi}{sup -} momentum of 1145 MeV/c. A polarized proton target was used, and the {Sigma}{sup -} polarization was found by measuring the difference in the production-rate of K{sup +} mesons for protons polarized along the production-plane normal and against it. Spark chambers were used to record the {pi}{sup -} and K{sup +} trajectories, and the {pi}{sup -} momentum was obtained from a magnetic spectrometer while the K{sup +} momentum was obtained from a range telescope. Each event was kinematically reconstructed in a one constraint fit to help eliminate events produced from protons bound in heavy nuclei of the target. The {Sigma}{sup -} polarization was found to be -0.36 {+-} 0.46.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USAEC
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 932538
• Report Number(s): UCRL--17152-Rev.
• Journal Information: Physical Review, Journal Name: Physical Review Journal Issue: 5 Vol. 167
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HEAVY NUCLEI
MAGNETIC SPECTROMETERS
MESONS
POLARIZATION
PROTONS
SPARK CHAMBERS
TARGETS
TRAJECTORIES