CLAS physics database search results Measurement E159M56 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.727048 0.132016 90 0.599119 0.102086 150 0.683516 0.111411 210 0.634649 0.102907 270 0.699434 0.116039 330 0.657605 0.110788