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Abstract：
The boson resonance state X is produced along with f0(975) in the J/ψ hadronic decay process. If the X particle decays into a pair of pseudoscalar mesons its spin-parity is JPC=(odd)--. The helicity formalism of angular distribution of the process is presented. How to discriminate 1-- meson from 3-- meson for the X particle is discussed. We think that the X1(1573) which has been observed in the four prong channel (K+K-π+π-) and in company with f0(975)(→π+π-) by BES collaboration may be a new resonance state.
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