CLAS physics database search results Measurement E159M776 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.47968 0.0821198 90 0.469924 0.0781051 150 0.587445 0.103818 210 0.660731 0.118669 270 0.479507 0.0810477 330 0.485107 0.0898347