Abstract
We present an analysis of the decay J/psi..--> gamma..4..pi.. in the final states ..gamma pi../sup +/..pi../sup -/..pi../sup +/..pi../sup -/ and ..gamma pi../sup +/..pi../sup 0/..pi../sup -/..pi../sup 0/. The branching fractions obtained are B(J/psi..--> gamma pi../sup +/..pi../sup -/..pi../sup +/..pi../sup -/) = (3.05 +- 0.08 +- 0.45) x 10/sup -3/ and B(J/psi..--> gamma pi../sup +/..pi../sup 0/..pi../sup -/..pi../sup o/) = ( 8.3 +- 0.2 +- 3.1) x 10/sup -3/ for m/sub 4pi/ less than 2 GeV/c/sup 2/. The 4..pi.. invariant-mass distributions extend from 1.0 to 3.0 GeV/c/sup 2/, showing peaks at approximately 1.55 and 1.8 GeV/c/sup 2/. In an analysis of the 4..pi.. final state we find that roughly-equal50% of the events below 2 GeV/c/sup 2/ are pseudoscalar rhorho, the product branching fraction of which is determined to be B(psi..--> gamma..X/sub 0/-)B(X/sub 0/-..-->..rhorho) = (4.7 +- 0.3 +- 0.9) x 10/sup -3/. No other significant rhorho component is found, and upper limits on the product branching fraction B(J/psi..--> gamma..X)B(X..-->..rhorho) are presented for the theta(1690) and the g/sub T/ states near 2.2 GeV/c/sup 2/.
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