CLAS physics database search results Measurement E159M398 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.768218 0.117039 90 0.804775 0.120358 150 0.828808 0.135235 210 0.810362 0.123391 270 0.794656 0.119793 330 0.870695 0.14276