CLAS physics database search results Measurement E216M904 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0193615 0.00472047 0.00456275 54 0.0166233 0.00469516 0.00279443 90 0.030274 0.00583849 0.00436635 126 0.0357908 0.00581042 0.00430107 162 0.0408145 0.00675645 0.00458171 198 0.047978 0.0070563 0.0055448 234 0.0429094 0.00704834 0.00682135 270 0.0363531 0.0060051 0.00408757 306 0.0346667 0.00754085 0.00695887 342 0.0253423 0.00598368 0.00521346