J/psi decays into a vector and a pseudoscalar meson and the quark content of the eta and eta'

Journal Article · Sun Dec 01 00:00:00 EST 1985 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.32.2883· OSTI ID:6237801

Baltrusaitis, R M; Coffman, D; Hauser, J; Hitlin, D G; Richman, J D; Russell, J J; Schindler, R H; Dorfan, D E; Fabrizio, R; Grancagnolo, F

From a study of 2.7 x 10/sup 6/ J/psi decays with the Mark III detector at the SLAC storage ring SPEAR, we have obtained new measurements of the two-body decays of the J/psi into a vector and a pseudoscalar meson. We present branching ratios for decays to rho..pi.., KK((892), phieta, the previously unobserved modes phieta', ..omega..eta, ..omega..eta', ..omega pi../sup 0/, rho/sup 0/eta, and new upper limits on rho/sup 0/eta' and phi..pi../sup 0/. In the decay J/psi..-->..eta..pi../sup +/..pi../sup -/, we observe rho/sup 0/-..omega.. interference. The collection of measured branching ratios are simultaneously fit to a simple model of J/psi decays which includes strong and electromagnetic amplitudes and allows for violation of SU(3) invariance. Using this model, we calculate the strange- and nonstrange-quark content of the eta and eta' and conclude that (35 +- 18)% of the eta' wave function can be attributed to an additional component, e.g., gluonium or radial excitation. The measurement of the ..omega pi../sup 0/ branching ratio, when combined with that of the ..gamma pi../sup 0/ decay mode of the ..omega.., yields a determination of the ..omega pi../sup 0/ electromagnetic-form-factor ratio Vertical Barf(q/sup 2/ = m/sub J/psi/ /sup 2/)/f(q/sup 2/ = 0) Vertical Bar = 0.038 +- 0.006.

• Research Organization: California Institute of Technology, Pasadena, California 91125
• DOE Contract Number: AC03-76SF00515; AC02-76ER01195; AC03-81ER40050; AA03-76SF00034
• OSTI ID: 6237801
• Journal Information: Phys. Rev. D; (United States), Vol. 32:11
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ETA MESONS
ELECTROMAGNETIC FORM FACTORS
PARTICLE STRUCTURE
ETA-958 RESONANCES
PSI RESONANCES
HADRONIC PARTICLE DECAY
BRANCHING RATIO
GLUONS
MONTE CARLO METHOD
OMEGA-784 RESONANCES
PHI-1019 RESONANCES
PIONS
QUANTUM NUMBERS
QUARK MODEL
SPEAR
SU-3 GROUPS
TWO-BODY PROBLEM
WAVE FUNCTIONS
BOSONS
COMPOSITE MODELS
DECAY
ELEMENTARY PARTICLES
FORM FACTORS
FUNCTIONS
HADRONS
LIE GROUPS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MESON RESONANCES
MESONS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
RESONANCE PARTICLES
STORAGE RINGS
SU GROUPS
SYMMETRY GROUPS
VECTOR MESONS
645104* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Meson-Induced Interactions- (-1987)
645101 - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties