CLAS physics database search results Measurement E159M864 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.257049 0.0447794 90 0.276139 0.0434155 150 0.394027 0.0644412 210 0.372601 0.0611087 270 0.323888 0.0546894 330 0.304146 0.0545543