CLAS physics database search results Measurement E216M994 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0557563 0.0140974 0.00872142 54 0.0520658 0.00500424 0.00578476 90 0.0609529 0.00596665 0.01041672 126 0.0872513 0.0140586 0.00923414 162 0.0881189 0.0156461 0.00914879 198 0.121912 0.00912334 0.0117328 234 0.094948 0.00773046 0.00809507 270 0.0672149 0.00805841 0.00598517 306 0.0473113 0.00514318 0.00553019 342 0.0651524 0.0109045 0.01075621