Production of Q/sup 2/Q-bar/sup 2/ mesoniums in. gamma gamma. reactions, hardonic collisions, and J/psi radiative decays

Conference · Sun Jun 30 04:00:00 EDT 1985 · AIP Conf. Proc.; (United States)

OSTI ID:5953899

Liu, K F

The rho/sup 0/rho/sup 0/ enhancement and the rho/sup +/rho/sup -/ supression in ..gamma gamma.. reactions near the threshold is taken as a strong evidence for an exotic isotensor quantum number which signals for the multi-quark (Q/sup 2/Q-bar/sup 2/) structure. The mass and the cross sections agree well with the prediction based on the Q/sup 2/Q-bar/sup 2/ structure. The 2/sup + +/ phiphi resonance at 2.16 GeV in ..pi..p and pp collisions has been interpreted as a 2/sup + +/ s/sup 2/s-bar/sup 2/ mesonium. The calculated mass, width, and the cross sections are all in accord with the experimental data. The correlated J/psi pair produced around 7 GeV in ..pi..N collisions at 150 and 280 GeV/c has been considered as a 2/sup + +/ c/sup 2/c-bar/sup 2/ mesonium. The calculated cross sections and the longitudinal and transverse momentum distributions are consistent with the data. The calculated branching ratio for J/psi ..-->.. ..gamma..(Q/sup 2/Q-bar/sup 2/) 2/sup + +/ ..-->.. ..gamma.. rho/sup -/rho/sup 0/ is compatible with the recent experimental upper limit and the ratios of the helicity amplitudes are distinct from the ones measured in J/psi ..-->.. ..gamma.. theta(1700) ..-->.. ..gamma.. etaeta, ..gamma.. KK-bar. The branching ratio for J/..gamma.. ..-->.. ..gamma..(s/sup 2/s-bar/sup 2/) 2/sup + +/ ..-->.. ..gamma.. phiphi is predicted to be --10/sup -6/.

• Research Organization: Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
• OSTI ID: 5953899
• Report Number(s): CONF-8504133-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 132:1
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645103 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BRANCHING RATIO
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
HADRONS
HELICITY
INTERACTIONS
MESON RESONANCES
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PARTICLE WIDTHS
PHOTON-PHOTON INTERACTIONS
QUARK-ANTIQUARK INTERACTIONS
RADIATIVE DECAY
RESONANCE PARTICLES