CLAS physics database search results Measurement E216M158 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.269517 0.00959288 0.03429294 54 0.314257 0.0117562 0.03658335 90 0.343366 0.01072 0.04022548 126 0.496609 0.0179425 0.05491615 162 0.606175 0.0143972 0.06397031 198 0.584263 0.0162652 0.06494046 234 0.478414 0.0176766 0.05061972 270 0.333131 0.0123459 0.04110558 306 0.30906 0.00884093 0.03614836 342 0.27332 0.00812569 0.03432376