CLAS physics database search results Measurement E216M454 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.403551 0.0304354 0.06064109 54 0.357539 0.0123474 0.03694701 90 0.349576 0.0109338 0.02828931 126 0.368965 0.0102291 0.02854086 162 0.380142 0.0108224 0.02961086 198 0.385859 0.00987591 0.02916716 234 0.359887 0.0100079 0.02833481 270 0.35018 0.0139161 0.02938298 306 0.338285 0.0130614 0.03698561 342 0.339197 0.0128518 0.05606589