CLAS physics database search results Measurement E216M328 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.452385 0.0227758 0.08855354 54 0.484417 0.0161224 0.07032958 90 0.485389 0.0293377 0.05145034 126 0.500816 0.0129851 0.04284537 162 0.511416 0.0149163 0.03784527 198 0.537285 0.0115852 0.04059522 234 0.4826 0.013951 0.03704157 270 0.490334 0.0204076 0.04223118 306 0.49453 0.0148784 0.0458783 342 0.517383 0.0289133 0.07099998