CLAS physics database search results Measurement E216M230 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.557222 0.0166383 0.06444523 54 0.507422 0.0109781 0.04892673 90 0.580825 0.0128831 0.04789417 126 0.726655 0.0207969 0.05873497 162 0.92765 0.0193517 0.06798983 198 0.911307 0.0182092 0.06724203 234 0.725761 0.0143776 0.05554352 270 0.556672 0.0134975 0.04890516 306 0.49044 0.0117256 0.04911012 342 0.608974 0.0127196 0.06669114