CLAS physics database search results Measurement E216M274 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.328384 0.032674 0.08798173 54 0.27267 0.0198687 0.03314691 90 0.270265 0.0182573 0.0381089 126 0.320759 0.0220632 0.02808628 162 0.319452 0.0135304 0.02832333 198 0.303325 0.0147128 0.02429442 234 0.309554 0.0119651 0.02794062 270 0.276614 0.0145325 0.02287019 306 0.361276 0.0558484 0.03999166 342 0.299359 0.046725 0.05182212