CLAS physics database search results Measurement E159M317 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.949934 0.145906 90 0.637973 0.0932132 150 0.825965 0.120939 210 0.792044 0.118851 270 0.647595 0.0958855 330 0.978267 0.153095