CLAS physics database search results Measurement E216M1003 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0573107 0.0125177 0.0166134 54 0.0469825 0.00512135 0.00655175 90 0.0905797 0.0133983 0.01054494 126 0.103933 0.0139347 0.01190908 162 0.116279 0.00871597 0.01312919 198 0.125349 0.011606 0.01478297 234 0.0755242 0.00704662 0.0081106 270 0.071253 0.017454 0.01947363 306 0.0547506 0.00700567 0.00753374 342 0.03702 0.00847191 0.00669832