Missing-mass search for negative-charge bosons with masses between 2 and 12. 5 GeV

A missing-mass search has been made for negatively charged boson resonances B/sup -/ produced in the reaction ..pi../sup -/p ..-->.. B/sup -/p at beam momenta of 40, 100, 200, and 240 GeV. Approximately 600 000 events were included in the final mass spectra. In the mass region 2 < or = M/sub B/ < or = 12.5 GeV no statistically significant enhancements were observed. The 5-standard-deviation upper limit on the production of narrow resonances is of the order of 10 ..mu..b for 2 < or = M/sub B/ < or = 10.5 GeV.