CLAS physics database search results Measurement E216M967 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0682567 0.0155102 0.0103081 54 0.0621285 0.00823877 0.00670043 90 0.0717168 0.00754649 0.00695647 126 0.101121 0.0110072 0.00962441 162 0.107035 0.0084049 0.00896116 198 0.0998597 0.00806197 0.00818326 234 0.0837362 0.0071501 0.00800324 270 0.081449 0.00840539 0.00884059 306 0.0747363 0.00950445 0.00783446 342 0.0489345 0.0113915 0.00767