CLAS physics database search results Measurement E159M794 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.47996 0.0927027 90 0.393493 0.0715466 150 0.425592 0.07263 210 0.435654 0.0778051 270 0.423679 0.0834902 330 0.400713 0.0757931