CLAS physics database search results Measurement E216M581 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.206151 0.0074352 0.01988142 54 0.204577 0.007074 0.01904144 90 0.241104 0.00918264 0.02047578 126 0.287769 0.0103456 0.02368506 162 0.289463 0.0113034 0.0234257 198 0.280459 0.014456 0.02366737 234 0.282209 0.017404 0.02572415 270 0.231436 0.00943777 0.02275639 306 0.216977 0.00786464 0.01940887 342 0.218521 0.00791443 0.02089116