CLAS physics database search results Measurement E159M866 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.300702 0.0575545 90 0.338344 0.0692007 150 0.383576 0.080904 210 0.321065 0.059259 270 0.309669 0.0585811 330 0.357171 0.0726705