CLAS physics database search results Measurement E216M355 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.410882 0.0154576 0.04633992 54 0.449354 0.0356175 0.04936441 90 0.478148 0.0265602 0.0380896 126 0.527318 0.0162493 0.03900308 162 0.616794 0.0174164 0.04876242 198 0.630358 0.0129696 0.04529283 234 0.549466 0.0152441 0.0424636 270 0.450516 0.0144679 0.03674274 306 0.427181 0.0185593 0.03626146 342 0.433252 0.0341025 0.08995848