CLAS physics database search results Measurement E216M464 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.310708 0.00835004 0.03382766 54 0.29751 0.00778305 0.02922565 90 0.401243 0.0555503 0.05287086 126 0.408604 0.0188045 0.04336611 162 0.51268 0.0208539 0.04112654 198 0.475037 0.0342359 0.03946967 234 0.427282 0.011808 0.03778716 270 0.338681 0.00956178 0.03073016 306 0.3178 0.00955971 0.03057145 342 0.322447 0.00919161 0.03579262