CLAS physics database search results Measurement E216M643 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0824405 0.0158936 0.01299542 54 0.0675219 0.0132238 0.01341074 90 0.07377 0.00683746 0.00601011 126 0.080102 0.0119724 0.01039123 162 0.0923647 0.00820476 0.00734313 198 0.0884075 0.0075023 0.00867269 234 0.0812035 0.00665621 0.00943116 270 0.0871889 0.0128442 0.00811985 306 0.0601851 0.00904698 0.00939808 342 0.0517481 0.00787452 0.01748416