CLAS physics database search results Measurement E216M760 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0354712 0.0110322 0.00630564 54 0.0221527 0.00440461 0.00285349 90 0.0345184 0.00640913 0.00287672 126 0.0397951 0.00760902 0.00444822 162 0.0368638 0.00601415 0.00288196 198 0.041616 0.00624523 0.00481458 234 0.0481967 0.00659677 0.00489196 270 0.0294405 0.00535595 0.0027888 306 0.0179711 0.00451208 0.00291433 342 0.0279647 0.00723964 0.00599996