Using a double arm electromagnetic calorimeter we have searched for narrow states produced in the exclusive reaction π-p→γγn at 13 GeV/c. No enhancements were observed in the mass range 2.0-4.0 GeV/c2. For example, the 90% confidence limit on ηc production is σ(π-p→ηcn)× B(ηc→γγ) < 44 pb.
ASJC Scopus subject areas
- Nuclear and High Energy Physics