CLAS physics database search results Measurement E216M554 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.168299 0.00757846 0.01787193 54 0.199129 0.0147452 0.02581385 90 0.200003 0.00810157 0.0198873 126 0.271669 0.0124656 0.02430472 162 0.296013 0.0114614 0.02888214 198 0.276116 0.0129906 0.02677092 234 0.253424 0.012418 0.02330678 270 0.216417 0.00971924 0.02002946 306 0.17969 0.0101312 0.01901159 342 0.168235 0.0124876 0.01980883