CLAS physics database search results Measurement E216M985 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0545857 0.00891259 0.0086816 54 0.0590209 0.0142348 0.01128787 90 0.0814007 0.0111879 0.00830513 126 0.0784035 0.0158643 0.01008194 162 0.0916557 0.010302 0.00936056 198 0.106838 0.00874382 0.00942571 234 0.090876 0.00869628 0.00756167 270 0.0677914 0.00605559 0.00577083 306 0.0532627 0.00916305 0.00654703 342 0.0704526 0.0111234 0.00839582