CLAS physics database search results Measurement E159M983 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.290579 0.0576554 90 0.319868 0.0706694 150 0.29288 0.0642036 210 0.312648 0.0619451 270 0.277041 0.0493607 330 0.303091 0.0609719