CLAS physics database search results Measurement E216M886 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0402234 0.0166114 0.00950904 54 0.0123493 0.00536194 0.0022224 90 0.0135427 0.00578106 0.00211244 126 0.0140204 0.00453784 0.0020646 162 0.029557 0.0067442 0.00488039 198 0.0221391 0.00586792 0.00265452 234 0.0288063 0.00599511 0.00295181 270 0.0217165 0.00587408 0.0033427 306 0.0198938 0.00579599 0.00362128 342 0.0123428 0.00479624 0.00599736