Measurement of the. Sigma. sup 0 yields. Sigma. sup 0. gamma. branching ratio
Thesis/Dissertation
·
OSTI ID:6902636
The data on hyperon weak radiative decays is scarce. The branching ratios for most of these rare decays have been measured but no events of the {Sigma}{sup 0} {yields} {Sigma}{sup 0} {gamma} type have yet been observed. A search was made for {Sigma}{sup 0} {yields} {Sigma}{sup 0}{gamma} decays in experiment 751 at Brookhaven National Laboratory, at 6.0 GeV/c momentum K{sup {minus}} beam, using the Multiparticle Spectrometer (MPS) and a lead glass calorimeter. The produced {Sigma}{sup 0} decayed into a {Lambda} and a {gamma} and the {Lambda} was detected via its {Lambda} {yields} p{pi}{sup {minus}} decay mode. The p and {pi}{sup {minus}} trajectories were reconstructed in the MPS and both photons were detected in the lead glass. A sample of 452 events containing a {Lambda} and at lest two photons satisfied all the selection criteria. Of these events, 145 had a {Lambda}{gamma} mass in the {Sigma}{sup 0} mass range. The expected background and signal curves were generated by Monte Carlo calculation. A background and signal fit to the data yielded 0{sub {minus}14}{sup +7.3} signal events which corresponds to an upper limit of 8.0 {times} 10{sup {minus}3} for the {Sigma}{sup 0} {yields} {Sigma}{sup 0}{gamma} branching ratio at the 90% confidence level. This result is in agreement with the measured branching ratios for similar hyperon radiative decays.
- Research Organization:
- Brandeis Univ., Waltham, MA (USA)
- OSTI ID:
- 6902636
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645000* -- High Energy Physics
645103 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON REACTIONS
BARYONS
BRANCHING RATIO
BROOKHAVEN CYCLOTRON
CALCULATION METHODS
CYCLIC ACCELERATORS
CYCLOTRONS
DATA
DATA ANALYSIS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HADRON REACTIONS
HADRONS
HYPERON REACTIONS
HYPERONS
INFORMATION
ISOCHRONOUS CYCLOTRONS
LAMBDA BARYONS
LAMBDA PARTICLES
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MEASURING METHODS
MONTE CARLO METHOD
MULTIPARTICLE SPECTROMETERS
NUCLEAR REACTIONS
NUMERICAL DATA
PHOTONS
RADIATIVE DECAY
SPECTROMETERS
STRANGE PARTICLES
XI BARYONS
XI PARTICLES
645103 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON REACTIONS
BARYONS
BRANCHING RATIO
BROOKHAVEN CYCLOTRON
CALCULATION METHODS
CYCLIC ACCELERATORS
CYCLOTRONS
DATA
DATA ANALYSIS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HADRON REACTIONS
HADRONS
HYPERON REACTIONS
HYPERONS
INFORMATION
ISOCHRONOUS CYCLOTRONS
LAMBDA BARYONS
LAMBDA PARTICLES
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MEASURING METHODS
MONTE CARLO METHOD
MULTIPARTICLE SPECTROMETERS
NUCLEAR REACTIONS
NUMERICAL DATA
PHOTONS
RADIATIVE DECAY
SPECTROMETERS
STRANGE PARTICLES
XI BARYONS
XI PARTICLES