CLAS physics database search results Measurement E216M823 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0793129 0.00815365 0.01742013 54 0.0888866 0.00933216 0.01073778 90 0.0975404 0.00745212 0.00830897 126 0.0976797 0.00605538 0.00771962 162 0.104697 0.00647901 0.00813204 198 0.116735 0.00682746 0.0105176 234 0.106288 0.00645431 0.00958566 270 0.111564 0.0104417 0.00899952 306 0.0875854 0.00823362 0.0086593 342 0.0902842 0.00699626 0.01543069