CLAS physics database search results Measurement E216M590 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.192732 0.00633172 0.01793924 54 0.207386 0.00788742 0.01783946 90 0.222762 0.00754598 0.0207652 126 0.305901 0.0096621 0.02371163 162 0.329886 0.0106202 0.02514895 198 0.324248 0.0151704 0.02650194 234 0.281655 0.0105335 0.02307715 270 0.212179 0.009522 0.01754246 306 0.18296 0.00708296 0.0157911 342 0.193258 0.00659052 0.01805485