CLAS physics database search results Measurement E159M416 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.774422 0.122791 90 0.742335 0.113629 150 0.87869 0.139479 210 0.811151 0.138064 270 0.759528 0.119969 330 0.787175 0.144294