CLAS physics database search results Measurement E216M697 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.143388 0.0158507 0.02269617 54 0.117299 0.00729371 0.01180479 90 0.14283 0.00772558 0.01144238 126 0.158624 0.00805492 0.01252962 162 0.15637 0.00907264 0.01233351 198 0.168317 0.00883543 0.01284806 234 0.169626 0.00685425 0.01267692 270 0.155097 0.0069627 0.01153026 306 0.141482 0.00855175 0.01374842 342 0.147697 0.0110384 0.02032499