CLAS physics database search results Measurement E216M184 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.703857 0.0235572 0.11991358 54 0.821896 0.0391569 0.0941411 90 0.805144 0.0207139 0.06555282 126 0.81592 0.0153163 0.06070213 162 0.828944 0.0166966 0.0630892 198 0.885482 0.0176679 0.06586444 234 0.846889 0.026425 0.066138 270 0.819611 0.0179223 0.07366439 306 0.833483 0.0436467 0.09294705 342 0.845048 0.0464924 0.1330045