CLAS physics database search results Measurement E216M689 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.132648 0.0085499 0.0137031 54 0.146781 0.00699766 0.01435581 90 0.162471 0.00869833 0.01478611 126 0.192231 0.00812992 0.02901145 162 0.204641 0.0113641 0.0195555 198 0.225211 0.0176302 0.02146748 234 0.188399 0.00884403 0.01801613 270 0.159128 0.008947 0.0153997 306 0.170407 0.00874344 0.01533838 342 0.158741 0.00753565 0.01552271