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Decays of the J/psi into two pseudoscalar mesons

Journal Article · · Phys. Rev. D; (United States)
; ; ; ; ; ; ; ; ;
New results are obtained for the decays J/psi..--> pi../sup +/..pi../sup -/ and J/psi..-->..K/sup +/K/sup -/. The first observation of the decay J/psi..-->..K/sub S//sup 0/K/sub L//sup 0/ is reported. Branching ratios are measured to be (1.58 +- 0.20 +- 0.15) x 10/sup -4/, (2.39 +- 0.24 +- 0.22) x 10/sup -4/, and (1.01 +- 0.16 +- 0.09) x 10/sup -4/, respectively. The corresponding electromagnetic form factors are Vertical BarF +- Vertical Bar/sup 2/ = (11.9 +- 1.5 +- 0. 9) x 10/sup -3/ and Vertical BarF/sub K//sup + -/Vertical Bar/sup 2/ = (20.9 +- 2.1 +- 1. 5) x 10/sup -3/. The K/sub S//sup 0/-K/sub L//sup 0/ transition form factor Vertical BarF/sub K//sub s//sup 0/..-->..K/sub L//sup 0/Vertical Bar /sup 2/ = (8.9 +- 1.4 +- 0.5) x 10/sup -3/ is obtained. A 90%-confidence-level upper limit of 5.2 x 10/sup -6/ is given for the branching ratio for the decay J/psi..-->..K/sub S//sup 0/K/sub S//sup 0/. These form factors are substantially larger than expectations based on vector dominance and indicate large SU/sub 3/-symmetry-breaking effects.
Research Organization:
California Institute of Technology, Pasadena, California 91125
DOE Contract Number:
AC03-76SF00515; AC02-76ER01195; AC03-81ER40050; AA03-76SF00034
OSTI ID:
5410387
Journal Information:
Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 32:3; ISSN PRVDA
Country of Publication:
United States
Language:
English

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Related Subjects

645201* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- General & Scattering Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
COINCIDENCE SPECTROMETRY
DECAY
ELECTROMAGNETIC FORM FACTORS
ELEMENTARY PARTICLES
FORM FACTORS
HADRONS
INTERACTIONS
KAONS
LIE GROUPS
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
PAIR PRODUCTION
PARTICLE DECAY
PARTICLE PROPERTIES
PIONS
PSEUDOSCALAR MESONS
PSI RESONANCES
RESONANCE PARTICLES
SPEAR
SPECTROMETERS
STORAGE RINGS
STRANGE PARTICLES
SU GROUPS
SU-3 GROUPS
SYMMETRY BREAKING
SYMMETRY GROUPS
TIME-OF-FLIGHT SPECTROMETERS
VECTOR MESONS
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY