CLAS physics database search results Measurement E159M326 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 1.013 0.147739 90 0.863919 0.126875 150 0.991614 0.138465 210 1.04854 0.14875 270 0.9236 0.135266 330 1.07859 0.154398