CLAS physics database search results Measurement E159M164 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 1.09274 0.179904 90 1.00527 0.158673 150 1.05053 0.159404 210 1.16179 0.188956 270 1.14474 0.175355 330 1.21156 0.19224