CLAS physics database search results Measurement E216M319 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.525392 0.0338062 0.07303297 54 0.544155 0.0389141 0.05394134 90 0.565577 0.0225059 0.05119144 126 0.511495 0.0174369 0.03724953 162 0.538847 0.0122015 0.03959157 198 0.534784 0.0116882 0.04048296 234 0.54086 0.0172116 0.03934989 270 0.505574 0.0152782 0.04025528 306 0.503387 0.0316435 0.05222313 342 0.528895 0.0342861 0.07109367