CLAS physics database search results Measurement E216M535 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0953885 0.00784003 0.03223801 54 0.137338 0.0120662 0.0156946 90 0.140481 0.0100627 0.01406805 126 0.162939 0.0087611 0.01344366 162 0.155563 0.00807719 0.01298054 198 0.154799 0.00777613 0.01259474 234 0.149873 0.00776788 0.01307177 270 0.133967 0.00868525 0.01180666 306 0.133633 0.0122466 0.01249362 342 0.126899 0.0173929 0.02106077