CLAS physics database search results Measurement E159M389 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.840365 0.137469 90 0.781997 0.120158 150 0.852403 0.130145 210 0.862923 0.134113 270 0.803833 0.122481 330 0.848832 0.142364