CLAS physics database search results Measurement E159M666 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.0800269 0.018889 90 0.108276 0.0181778 150 0.0948436 0.0179861 210 0.122273 0.0228375 270 0.103169 0.0179105 330 0.0795634 0.0159241