Abstract
The production of η and X° mesons has been investigated in four and six prong events from π +p interactions at 5.45 GeV/ c. The cross sections for the quasi two body states Δ ++ η and Δ ++X° were found to be 0.076±0.013 mb and 0.017±0.006 mb respectively. A comparison of the matrix elements for these reactions yields an η−X° mixing angle different from that predicted by the quadratic mass formula by about 20°, but within 6° of the linear mass formula result.
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