CLAS physics database search results Measurement E159M515 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Stat. error deg mcb/rad mcb/rad 30 0.460634 0.093677 90 0.32377 0.0560397 150 0.357154 0.0738833 210 0.343042 0.0671432 270 0.316835 0.0600274 330 0.450892 0.0817751