CLAS physics database search results Measurement E159M596 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.472034 0.089845 90 0.454631 0.07852 150 0.55289 0.0929255 210 0.543946 0.0998867 270 0.474667 0.0805297 330 0.528874 0.0915308