CLAS physics database search results Measurement E216M562 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.37311 0.0609784 0.06206722 54 0.283864 0.0178065 0.03128153 90 0.298346 0.013616 0.02375462 126 0.296654 0.0108849 0.02259037 162 0.306251 0.0100947 0.02310198 198 0.308343 0.0115603 0.02433777 234 0.301007 0.010703 0.02268296 270 0.284993 0.019298 0.0208867 306 0.300373 0.0204403 0.03866213 342 0.329485 0.0449302 0.04428256