CLAS physics database search results Measurement E216M517 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.113284 0.0130514 0.01907515 54 0.13595 0.0157094 0.01727794 90 0.117936 0.0106968 0.01091554 126 0.133906 0.00866032 0.01059459 162 0.167876 0.0115217 0.01614727 198 0.151865 0.0216256 0.0141026 234 0.145388 0.0120126 0.01076812 270 0.126542 0.00958093 0.01099856 306 0.110184 0.0131628 0.01587418 342 0.131295 0.0193137 0.02051923