Observation of the decay eta/sub c/. -->. phiphi and determination of the eta/sub c/ spin and parity

Journal Article · Mon Jun 11 04:00:00 EDT 1984 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.52.2126· OSTI ID:6954112

Baltrusaitis, R M; Becker, J J; Blaylock, G T; Brown, J S; Bunnell, K O; Burnett, T H; Cassell, R E; Coffman, D; Cook, V; Coward, D H

In a study of 2.7 million J/psi decays with the Mark III, a new magnetic detector at SPEAR, we have observed the sequential decay J/psi..--> gamma..eta/sub c/, eta/sub c/..-->..phiphi. The product branching fraction is (1.02 +- 0.25 +- 0.14) x 10/sup -4/, where the quoted errors are statistical and systematic, respectively. Analysis of the final-state angular distributions provides the first experimental determination that the spin and parity of the eta/sub c/ are 0/sup -/.

• Research Organization: Mark III Collaboration California Institute of Technology, Pasadena, California 91125
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6954112
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 52:24; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
645104 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BOSONS
BRANCHING RATIO
CHARM PARTICLES
CHARMED MESON RESONANCES
DATA
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
ETA MESONS
EXPERIMENTAL DATA
HADRONIC PARTICLE DECAY
HADRONS
INFORMATION
MASS SPECTRA
MESON RESONANCES
MESONS
MONTE CARLO METHOD
NUMERICAL DATA
PARITY
PARTICLE DECAY
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHI-1019 RESONANCES
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
PSI RESONANCES
RADIATIVE DECAY
RESONANCE PARTICLES
SPEAR
SPECTRA
SPIN
STORAGE RINGS
TIME-OF-FLIGHT METHOD
VECTOR MESONS