Production of chi (2. 85) particles in the charge-exchange reaction. pi. /sup -/p. -->. chin, chi. -->. 2. gamma. at momentum of 40 GeV/c

The invariant-mass spectrum of neutral states produced in charge-exchange scattering of 40-GeV/c ..pi../sup -/ mesons on protons is studied to search for heavy particles which decay into two ..gamma.. rays. The ..gamma.. rays were detected by a hodoscope spectrometer on-line with a computer. The mass spectrum shows a peak which is identified with chi (2.85). The reaction cross section times the branching ratio of the decay chi..-->..2..gamma.. is found to be 2 x 10/sup -34/ cm/sup 2/.