Measurement of the polarization and magnetic moment of. Xi. sup + antihyperons produced by 800-GeV/ c protons
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)
- Fermilab, Batavia, Illinois 60510 (United States)
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 (United States)
The polarization of {bar {Xi}} {sup +} hyperons produced by 800-GeV/{ital c} protons in the inclusive reaction {ital p}+Be{r arrow}{bar {Xi}} {sup +}+{ital X} has been measured using a sample of 70 000 {bar {Xi}} {sup +} decays. The average polarization of the {bar {Xi}} {sup +}, at a mean {ital x}{sub {ital F}}=0.39 and {ital p}{sub {ital t}}=0.76 GeV/{ital c}, is {minus}0.097{plus minus}0.012{plus minus}0.009, compared to {minus}0.102{plus minus}0.012{plus minus}0.010 for the {Xi}{sup {minus}}. The large polarization found for the {bar {Xi}} {sup +} is not expected in any model for polarization of inclusively produced hyperons. The magnetic moment of the {bar {Xi}} {sup +} was measured to be 0.657{plus minus}0.028{plus minus}0.020 nuclear magnetons ({mu}{sub {ital N}}), compared to ({minus}0.674{plus minus}0.021{plus minus}0.020){mu}{sub {ital N}} for the {Xi}{sup {minus}}, in good agreement with {ital CPT} invariance.
- OSTI ID:
- 5926049
- Journal Information:
- Physical Review, D (Particles Fields); (United States), Vol. 44:11; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
ANTIXI PARTICLES
MAGNETIC MOMENTS
PROTON-NUCLEON INTERACTIONS
PARTICLE PRODUCTION
ANTIHYPERONS
BERYLLIUM
GEV RANGE 100-1000
INCLUSIVE INTERACTIONS
POLARIZATION
ALKALINE EARTH METALS
ANTIBARYONS
ANTIMATTER
ANTIPARTICLES
BARYON-BARYON INTERACTIONS
BARYONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
GEV RANGE
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INTERACTIONS
MATTER
METALS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
STRANGE PARTICLES
XI BARYONS
XI PARTICLES
662340* - Hadron Interactions- (1992-)
664400 - Experimentally Derived Information on Atomic & Molecular Properties- (1992-)