CLAS physics database search results Measurement E159M488 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.368021 0.0734047 90 0.303994 0.0659596 150 0.282416 0.0482535 210 0.318997 0.0691132 270 0.244342 0.0418169 330 0.367523 0.0730879