CLAS physics database search results Measurement E159M981 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.261169 0.0423941 90 0.292152 0.0485557 150 0.347948 0.0588028 210 0.254114 0.042513 270 0.301641 0.0478652 330 0.258395 0.0425768