Search for hidden charm states decaying into [ital J]/[psi] or [psi][prime] plus pions

A search has been made in 300 GeV/[ital c] [pi][sup [plus minus]]- and proton-Li interactions for production of states that decay into [ital J]/[psi] or [psi][prime] plus one or two pions. A 2.5[sigma] enhancement in the [ital J]/[psi] [pi][sup 0] spectrum, possibly the recently reported [sup 1][ital P][sub 1] state of charmonium, is observed at a mass of 3.527 GeV/[ital c][sup 2]. In the [ital J]/[psi] plus two pion mass spectrum, we report, together with the expected [psi][prime][r arrow][ital J]/[psi] [pi][sup +][pi][sup [minus]], the tentative observation of a structure at a mass of 3.836 GeV/[ital c][sup 2]. No enhancements are seen in the [ital J]/[psi] [pi][sup [plus minus]][pi][sup [plus minus]], [ital J]/[psi] [pi][sup [plus minus]][pi][sup 0], [ital J]/[psi] [pi][sup [plus minus]], or [psi][prime] [pi][sup [plus minus]] mass spectra.