CLAS physics database search results Measurement E216M859 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0756106 0.00726818 0.00982575 54 0.0683961 0.00666921 0.00683011 90 0.0799487 0.00737539 0.00722204 126 0.0993118 0.0084383 0.0082586 162 0.116765 0.00705849 0.0099223 198 0.118219 0.00641475 0.0101915 234 0.0974722 0.00581279 0.0078656 270 0.092159 0.010138 0.0094763 306 0.0824468 0.00840426 0.00799181 342 0.0789341 0.0124681 0.01098324