CLAS physics database search results Measurement E216M446 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.370078 0.0135393 0.03834895 54 0.340031 0.0100417 0.03505504 90 0.367413 0.0105052 0.03549215 126 0.409273 0.0120099 0.04177915 162 0.487029 0.016372 0.0430706 198 0.438535 0.0119084 0.04087655 234 0.410389 0.0159176 0.03912567 270 0.351942 0.0112435 0.03642053 306 0.345794 0.0191562 0.03551092 342 0.344048 0.014246 0.03838909