CLAS physics database search results Measurement E216M634 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0446726 0.00936654 0.0114638 54 0.06707 0.0154753 0.01374201 90 0.0486185 0.0062615 0.00403122 126 0.0610276 0.00654874 0.00560956 162 0.0693234 0.00737019 0.00572422 198 0.0632276 0.00686697 0.00678481 234 0.0704036 0.00864168 0.00640507 270 0.0475848 0.00627593 0.00575948 306 0.0929271 0.032131 0.02570455 342 0.0560335 0.00873738 0.01168186