CLAS physics database search results Measurement E216M949 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0918448 0.0286398 0.02365923 54 0.0817277 0.0227856 0.01408558 90 0.0736017 0.00721003 0.0057111 126 0.0726106 0.0100002 0.00694965 162 0.0962594 0.00815217 0.00908647 198 0.0870633 0.00724071 0.00735361 234 0.0640049 0.00927848 0.00601751 270 0.0572698 0.0195938 0.00755353 306 0.0570215 0.00618766 0.00566444 342 0.0614615 0.00833261 0.00919308