CLAS physics database search results Measurement E159M856 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.338063 0.0614944 90 0.328271 0.0524729 150 0.348749 0.0539637 210 0.353777 0.0569568 270 0.279611 0.0484512 330 0.373819 0.0681239