CLAS physics database search results Measurement E159M630 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Stat. error deg mcb/rad mcb/rad 30 0.456881 0.0730273 90 0.465129 0.0733676 150 0.597619 0.0901773 210 0.603789 0.0975918 270 0.423775 0.0643161 330 0.445736 0.0749241