Measurement of the polarization and magnetic moment of. Xi. sup + antihyperons produced by 800-GeV/ c protons

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.44.3402· OSTI ID:5926049

Ho, P M; Longo, M J; Nguyen, A ^[1]; Luk, K B; James, C; Rameika, R ^[2]; Duryea, J; Guglielmo, G; Heller, K; Johns, K ^[3]; Diehl, H T; Teige, S; Thomson, G B; Zou, Y ^[4]

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1. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)
2. Fermilab, Batavia, Illinois 60510 (United States)
3. School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)
4. 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), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 44:11; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662340* -- Hadron Interactions-- (1992-)
664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
ANTIBARYONS
ANTIHYPERONS
ANTIMATTER
ANTIPARTICLES
ANTIXI PARTICLES
BARYON-BARYON INTERACTIONS
BARYONS
BERYLLIUM
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 100-1000
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INCLUSIVE INTERACTIONS
INTERACTIONS
MAGNETIC MOMENTS
MATTER
METALS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POLARIZATION
PROTON-NUCLEON INTERACTIONS
STRANGE PARTICLES
XI BARYONS
XI PARTICLES