CLAS physics database search results Measurement E159M506 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.325402 0.0604804 90 0.283625 0.0519799 150 0.328299 0.0754454 210 0.31006 0.071708 270 0.292676 0.0578067 330 0.388309 0.0774379