CLAS physics database search results Measurement E216M580 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.194288 0.013825 0.02790102 54 0.218175 0.0119127 0.02064219 90 0.245925 0.00976338 0.01867926 126 0.230395 0.00844066 0.01796134 162 0.252508 0.00899999 0.01937159 198 0.251783 0.00864632 0.01936327 234 0.252394 0.00872207 0.01893784 270 0.241918 0.00915374 0.0196674 306 0.227248 0.0193828 0.02407542 342 0.211551 0.0120118 0.03080512