CLAS physics database search results Measurement E159M137 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 1.24512 0.198527 90 1.1867 0.181861 150 1.28443 0.196414 210 1.32657 0.208859 270 1.15216 0.168903 330 1.2922 0.212554