CLAS physics database search results Measurement E159M90 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.655306 0.0926386 90 0.870706 0.11797 150 0.994769 0.134012 210 0.848873 0.114216 270 0.813307 0.110158 330 0.622557 0.0870044