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Charmonium spectroscopy from inclusive psi' and J/psi radiative decays

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

Results from a detailed study using the Crystal Ball detector at the SLAC e/sup +/e/sup -/ storage ring SPEAR of the inclusive photon spectra from 1.8 x 10/sup 6/ psi' and 2.2 x 10/sup 6/ J/psi decays are presented. Radiative transitions from the psi' to the chi/sub 2,1,0/ states are observed with photon energies of 126.0 +- 0.2 +- 4, 169.6 +- 0.3 +- 4, and 258.4 +- 0.4 +- 4 MeV and branching ratios B(psi'..--> gamma..chi/sub 2,1,0/) = (8.0 +- 0.5 +- 0.7)%, (9.0 +- 0.5 +- 0.7)%, and (9.9 +- 0.5 +- 0.8)%, respectively. Values for the natural linewidths of the chi states are obtained: GAMMA(chi/sub 2,1,0/) = 0.8--4.9, <3.8, and 13--21 MeV, respectively (90% C.L.). Improved values are found for the branching ratios B-italic(psi'..--> gamma..eta/sub c-italic/) = (0.28 +- 0.06)% and B-italic(J/psi..--> gamma..eta/sub c-italic/) = (1.27 +- 0.36)%, and for the natural width GAMMA(eta/sub c-italic/) = 11.5 +- 4.5 MeV.

Research Organization:
Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305
DOE Contract Number:
AC02-76ER03064; AC03-76SF00515; AC03-81ER40050; AC02-76ER03072
OSTI ID:
5521683
Journal Information:
Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 34:3; ISSN PRVDA
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
CHARMONIUM
CRYSTAL COUNTERS
ELEMENTARY PARTICLES
ETA-2980 RESONANCES
FIELD THEORIES
HADRONS
MEASURING INSTRUMENTS
MESONS
PARTICLE PRODUCTION
PSI-3105 RESONANCES
PSI-3695 RESONANCES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKONIUM
RADIATION DETECTORS
RADIATIVE DECAY