CLAS physics database search results Measurement E216M436 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.391409 0.0205639 0.0788859 54 0.399653 0.0156898 0.04453193 90 0.426994 0.0131623 0.03469834 126 0.410067 0.0136633 0.03104622 162 0.425965 0.0117155 0.03201146 198 0.443882 0.0125728 0.03317022 234 0.442673 0.0128029 0.03384801 270 0.43814 0.014097 0.03667886 306 0.430865 0.0291467 0.05317349 342 0.438586 0.0233806 0.0775681