CLAS physics database search results Measurement E159M594 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Stat. error deg mcb/rad mcb/rad 30 0.462969 0.0722634 90 0.482682 0.0731294 150 0.56872 0.0875574 210 0.569676 0.0849841 270 0.432103 0.0658526 330 0.422606 0.0668207