CLAS physics database search results Measurement E216M850 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.061192 0.0130196 0.00893709 54 0.0815208 0.00731456 0.00920213 90 0.0760685 0.00619348 0.00700285 126 0.101929 0.00840888 0.00978408 162 0.138944 0.00717279 0.01105246 198 0.119818 0.00684861 0.01014728 234 0.0972923 0.0088434 0.00925671 270 0.0915671 0.00821746 0.00951759 306 0.0788979 0.00817111 0.00922196 342 0.0706253 0.0103327 0.01023483