CLAS physics database search results Measurement E216M589 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.196764 0.0120701 0.02281735 54 0.190296 0.0137835 0.02052186 90 0.213936 0.0114487 0.01800351 126 0.249311 0.00943975 0.01861545 162 0.294174 0.00888139 0.02250172 198 0.303468 0.00848577 0.02232402 234 0.269272 0.00784451 0.02186917 270 0.245843 0.00981175 0.01887276 306 0.205989 0.0119315 0.0216773 342 0.162192 0.00953942 0.02275237