CLAS physics database search results Measurement E159M891 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.0840153 0.0179366 90 0.0895185 0.0180731 150 0.100959 0.0196966 210 0.109367 0.0228989 270 0.0982219 0.0196145 330 0.0505672 0.0186655