CLAS physics database search results Measurement E216M346 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.436093 0.0200274 0.05132492 54 0.458795 0.0245995 0.04829049 90 0.470206 0.0131958 0.03545528 126 0.510736 0.0154447 0.03816312 162 0.604204 0.0147085 0.04391278 198 0.616524 0.0152023 0.0451902 234 0.516006 0.0160507 0.03854813 270 0.487915 0.0151436 0.04287339 306 0.565779 0.141318 0.12031241 342 0.475569 0.0295372 0.05431847