CLAS physics database search results Measurement E216M976 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0764811 0.0120679 0.0083607 54 0.0776571 0.0138724 0.03902291 90 0.0860472 0.010725 0.01080228 126 0.079203 0.00624881 0.00771774 162 0.094785 0.011601 0.00852831 198 0.117994 0.00850613 0.01021261 234 0.0848025 0.00770594 0.00848203 270 0.0807997 0.00777937 0.00679671 306 0.0560137 0.00902764 0.00695731 342 0.0451134 0.00539515 0.00935051