CLAS physics database search results Measurement E216M428 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.285702 0.00891182 0.03438414 54 0.284658 0.0110714 0.03302809 90 0.305223 0.011991 0.03478998 126 0.387989 0.0110419 0.04000884 162 0.464737 0.0222072 0.0482038 198 0.463846 0.0162657 0.04761202 234 0.367307 0.0156585 0.04220835 270 0.300641 0.0116431 0.03444569 306 0.281464 0.0104063 0.03293488 342 0.254231 0.00905792 0.03232189