Erwin, A.R.
PI- P --> ETA/C(2980) N
Pion-Proton Scattering
[5.0, 10.0]
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EXPERIMENTAL SEARCH FOR NARROW RESONANCES IN THE REACTION PI- P ---> GAMMA GAMMA N AT 13-GEV/C

Chiang, I.H. ; Johnson, R.A. ; Kwan, B.P. ; et al.
Phys.Lett.B 140 (1984) 145-148, 1984.
Inspire Record 206508 DOI 10.17182/hepdata.30553

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/c 2 . For example, the 90% confidence limit on η c production is σ ( π − p→ η c n)× B ( η c → γγ ) < 44 pb.

1 data table
Table 1

UPPER LIMIT (90 PCT CL) FOR SIG*BR(ETA/C --> 2 GAMMA).