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Experimental limit on iota. --> gamma gamma. and the interpretation of the iota as a glueball

Journal Article · · Phys. Rev. Lett.; (United States)
; ; ; ; ; ; ; ; ;

By observing the reaction ..gamma gamma -->..K-italic/sub s-italic//sup 0/K/sup +-/..pi../sup minus-or-plus/, the TPC/Two-Gamma experiment at the SLAC e-italic/sup +/e/sup -/ storage ring PEP has obtained a 95%-confidence-level limit of GAMMA/sub iota//sub ..-->..//sub ..gamma..//sub ..gamma../B(iota..-->..KK-bar..pi..)<1.6 keV for the iota(1450) meson. If, as is likely, the iota decays predominantly into K-italicK-bar..pi.., the resulting GAMMA/sub iota//sub ..-->..//sub ..gamma..//sub ..gamma../ limit appears to conflict with previous assignments of an observed rho..gamma.. decay to iota and also with many analyses of eta-eta'-iota mixing. The contrast of this small ..gamma gamma.. width with the large rate for J-italic/psi..--> gamma..iota is evidence that the iota is a glueball with little admixture of q-italicq-bar states.

Research Organization:
Lawrence Berkeley Laboratory, Berkeley, California 94720; University of California, Davis, California 95616
OSTI ID:
5313618
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 57:1; ISSN PRLTA
Country of Publication:
United States
Language:
English

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Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
ELECTROMAGNETIC RADIATION
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
GAMMA RADIATION
GLUEBALLS
GLUON MODEL
HADRONS
INTERACTIONS
IONIZING RADIATIONS
IOTA-1440 RESONANCES
KAONS
KAONS NEUTRAL
KAONS NEUTRAL SHORT-LIVED
LEPTON-LEPTON INTERACTIONS
MASS SPECTRA
MASSLESS PARTICLES
MATHEMATICAL MODELS
MESONS
MONTE CARLO METHOD
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE MODELS
PEP STORAGE RINGS
PHOTONS
PIONS
PSEUDOSCALAR MESONS
RADIATIONS
RADIATIVE DECAY
SPECTRA
STORAGE RINGS
STRANGE MESONS
STRANGE PARTICLES