CLAS physics database search results Measurement E159M146 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 1.15349 0.189923 90 1.06114 0.163561 150 1.12829 0.176197 210 1.28833 0.206524 270 1.04333 0.159996 330 1.18304 0.188206