CLAS physics database search results Measurement E159M873 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.0580621 0.0163925 90 0.0403724 0.0100784 150 0.0492776 0.0107178 210 0.0533778 0.0129463 270 0.0475475 0.0118873 330 0.0332261 0.00985797