CLAS physics database search results Measurement E159M882 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.0458318 0.0125222 90 0.0558719 0.0123638 150 0.0978521 0.0223324 210 0.0861241 0.0177581 270 0.0780207 0.0155648 330 0.0552228 0.0137308