CLAS physics database search results Measurement E216M419 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.179462 0.0071274 0.02179766 54 0.181749 0.0069026 0.02281866 90 0.208449 0.00777504 0.0221404 126 0.276014 0.00959385 0.02806841 162 0.344056 0.0143336 0.03446333 198 0.327906 0.0116883 0.03467893 234 0.264019 0.0099054 0.02829566 270 0.182529 0.00715886 0.02124035 306 0.180132 0.00864988 0.0217975 342 0.184268 0.0152835 0.02322476