CLAS physics database search results Measurement E159M155 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 1.17865 0.194955 90 1.05018 0.158263 150 1.06724 0.174312 210 1.0285 0.161148 270 1.02974 0.158303 330 1.11761 0.181665