CLAS physics database search results Measurement E216M248 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.508722 0.0113202 0.05266603 54 0.444315 0.0115682 0.03951308 90 0.530048 0.0159625 0.0436424 126 0.57841 0.0237601 0.04494709 162 0.849938 0.0204197 0.06152538 198 0.886473 0.0314042 0.06786539 234 0.616504 0.0161547 0.04682052 270 0.477037 0.0146387 0.03932729 306 0.473847 0.013625 0.04104884 342 0.495186 0.0153228 0.05318382