CLAS physics database search results Measurement E216M356 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.44177 0.0110696 0.04508516 54 0.38267 0.015124 0.03490811 90 0.42988 0.0111555 0.0345551 126 0.552837 0.0141934 0.0419565 162 0.733626 0.0218155 0.05375707 198 0.682799 0.0151933 0.05054326 234 0.534803 0.014048 0.04091563 270 0.408156 0.0143287 0.03548083 306 0.416303 0.0147087 0.03693101 342 0.442755 0.0120634 0.04673252