CLAS physics database search results Measurement E159M92 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.914937 0.15438 90 0.747291 0.119693 150 0.840453 0.134684 210 0.998097 0.161124 270 0.816115 0.129572 330 0.872905 0.14229