CLAS physics database search results Measurement E216M293 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.257045 0.0121742 0.03205 54 0.268881 0.0124254 0.02986469 90 0.284389 0.0107138 0.03721211 126 0.404634 0.0213284 0.03727269 162 0.477121 0.0164611 0.04615443 198 0.486867 0.0165013 0.04716078 234 0.381747 0.0156826 0.03728386 270 0.368495 0.0938412 0.0713824 306 0.24407 0.00949676 0.0294421 342 0.245547 0.00927653 0.03005718