CLAS physics database search results Measurement E159M109 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 1.18098 0.161393 90 1.08614 0.153852 150 1.47166 0.202831 210 1.54125 0.213825 270 1.11993 0.156198 330 1.1727 0.162181