CLAS physics database search results Measurement E216M635 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0712184 0.010648 0.00872957 54 0.0497937 0.00531514 0.00730597 90 0.0451339 0.00477751 0.00741238 126 0.0499919 0.00639004 0.00999067 162 0.0847135 0.00972804 0.01184436 198 0.0618904 0.00634842 0.01042732 234 0.0687732 0.00720713 0.01112294 270 0.0473855 0.00534283 0.00809311 306 0.0475035 0.00521609 0.00739274 342 0.0509694 0.00518351 0.00720871