CLAS physics database search results Measurement E159M486 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.222757 0.0419011 90 0.330983 0.0487403 150 0.459494 0.0843722 210 0.400453 0.0593342 270 0.330971 0.0470342 330 0.282629 0.0485859