Study of the decay J/psi. --> gamma. eta. pi pi

Journal Article · Mon Sep 05 04:00:00 EDT 1983 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.51.859· OSTI ID:5540934

Edwards, C; Partridge, R; Peck, C; Porter, F C; Antreasyan, D; Gu, Y F; Kollman, W; Richardson, M; Strauch, K; Weinstein, A

The radiative decay J/psi..--> gamma nu pi pi.. has been studied with data taken with the crystal ball detector at the SPEAR e/sup +/e/sup -/ storage ring. In addition to the well-known eta', the eta..pi pi.. mass spectrum shows a broad enhancement centered at approx.1700 MeV. The authors have searched for the iota(1440) in the eta..pi pi.. mass spectrum and find R(J/psi..--> gamma..iota)(iota..-->..eta..pi pi..)/R(J/psi..--> gamma..iota)( iota..-->..KK..pi..)<0.5 (90% confidence level).

• Research Organization: Physics Department, California Institute of Technology, Pasadena, California 91125
• DOE Contract Number: AC03-76SF00515; AC02-76ER03064; AC03-81ER40050; AC02-76ER03072
• OSTI ID: 5540934
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 51:10; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CRYSTAL COUNTERS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ETA MESONS
GAMMA RADIATION
HADRONS
IONIZING RADIATIONS
MASS SPECTRA
MATHEMATICAL SPACE
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
PARTICLE PRODUCTION
PHASE SPACE
PIONS
PSEUDOSCALAR MESONS
PSI RESONANCES
RADIATION DETECTORS
RADIATIONS
RADIATIVE DECAY
RESONANCE PARTICLES
SPACE
SPEAR
SPECTRA
STORAGE RINGS
VECTOR MESONS