CLAS physics database search results Measurement E216M157 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.382591 0.0418526 0.07681867 54 0.420227 0.0268213 0.07068723 90 0.41772 0.0149324 0.03201571 126 0.433695 0.0125248 0.03468228 162 0.460173 0.0133295 0.03610085 198 0.464411 0.0113298 0.03525221 234 0.453173 0.0170943 0.03606025 270 0.423785 0.0159915 0.03965183 306 0.41235 0.0264292 0.03965576 342 0.376654 0.0245224 0.09225446