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Branching ratio and asymmetry for. Xi. sup 0 r arrow. Lambda. gamma

Journal Article · · Physical Review Letters; (USA)
;  [1]; ; ; ; ;  [2]; ; ; ; ;  [3]; ; ; ; ; ;  [4]
  1. School of Physics School of Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (USA)
  2. Physics Department, University of Michigan, Ann Arbor, Michigan 48109 (USA)
  3. Physics Department, University of Wisconsin, Madison, Wisconsin 53706 (USA)
  4. Department of Physics Department of Astronomy, Rutgers-The State University of New Jersey, Piscataway, New Jersey 08855-0849 (USA)
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We have measured the branching ratio {Gamma}({Xi}{sup 0}{r arrow}{Lambda}{gamma})/{Gamma}({Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0}) to be (1.06{plus minus}0.12(stat){plus minus}0.11(syst)){times}10{sup {minus}3}. In 670 000 {Lambda}{gamma} candidates we found 116{plus minus}13 {Xi}{sup 0}{r arrow}{Lambda}{gamma} decays (background subtracted). These compare with 29 510 {Xi}{sup 0}{r arrow}{Lambda}{pi}{sup 0} events reconstructed from the {Lambda}{gamma}{gamma} sample. Monte Carlo studies gave the relative acceptances for the two processes. The helicity of the {Lambda} yielded the product of asymmetry parameters {alpha}({Lambda}{r arrow}{ital p}{pi}{sup {minus}}){alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.27{plus minus}0.28, which implies {alpha}({Xi}{sup 0}{r arrow}{Lambda}{gamma})=0.43{plus minus}0.44, where the uncertainty is all statistical.
OSTI ID:
6850724
Journal Information:
Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:8; ISSN PRLTA; ISSN 0031-9007
Country of Publication:
United States
Language:
English

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Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ASYMMETRY
BARYON-BARYON INTERACTIONS
BARYONS
BOSONS
BRANCHING RATIO
DATA ANALYSIS
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 100-1000
HADRON-HADRON INTERACTIONS
HADRONIC PARTICLE DECAY
HADRONS
HYPERONS
INTERACTIONS
LAMBDA BARYONS
LAMBDA-1405 BARYONS
MASS SPECTRA
MASSLESS PARTICLES
MEASURING METHODS
MESONS
MONTE CARLO METHOD
NUCLEON-NUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PHOTONS
PIONS
PIONS NEUTRAL
PROTON-NUCLEON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATIVE DECAY
SPECTRA
STRANGE PARTICLES
XI BARYONS
XI NEUTRAL PARTICLES
XI PARTICLES