CLAS physics database search results Measurement E159M234 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.1321 0.0199389 90 0.25586 0.033893 150 0.302517 0.0395554 210 0.32663 0.0434075 270 0.241451 0.0324158 330 0.154136 0.0223999