CLAS physics database search results Measurement E159M479 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.472749 0.0840472 90 0.310104 0.0521044 150 0.390918 0.0879576 210 0.362507 0.0726409 270 0.310502 0.0573009 330 0.418937 0.0841385