CLAS physics database search results Measurement E216M238 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.51138 0.0463548 0.06476545 54 0.533489 0.0312245 0.04816848 90 0.551242 0.0138471 0.04476638 126 0.645751 0.0167104 0.05265963 162 0.757861 0.0136141 0.05675086 198 0.777763 0.0149118 0.0569181 234 0.65752 0.0201869 0.05480543 270 0.510844 0.0390803 0.1023218 306 0.539979 0.015365 0.04747965 342 0.552172 0.0270733 0.054415