CLAS physics database search results Measurement E216M463 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.330677 0.0179519 0.04538807 54 0.310345 0.0142781 0.03056748 90 0.345353 0.0149248 0.0294929 126 0.37661 0.0111256 0.02911695 162 0.434529 0.0102785 0.03450354 198 0.410391 0.00966374 0.03167552 234 0.385446 0.00992723 0.03168931 270 0.345565 0.0131064 0.02987329 306 0.295961 0.0108414 0.03078234 342 0.325196 0.0172891 0.04294426