CLAS physics database search results Measurement E159M803 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.424349 0.0784053 90 0.395934 0.0697146 150 0.438465 0.0802804 210 0.507122 0.0968652 270 0.358361 0.0582322 330 0.431927 0.0887393