CLAS physics database search results Measurement E216M292 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.266843 0.0169789 0.04061977 54 0.311939 0.0157565 0.02975191 90 0.315838 0.0117888 0.02575417 126 0.357988 0.0110182 0.02831686 162 0.361296 0.0142596 0.02923297 198 0.390423 0.0118157 0.03041672 234 0.36422 0.0125373 0.02830012 270 0.323699 0.0144783 0.02533546 306 0.318081 0.019078 0.03601023 342 0.298781 0.027627 0.06270476