CLAS physics database search results Measurement E216M284 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.205298 0.0124768 0.02424344 54 0.204548 0.0140556 0.02481743 90 0.256413 0.010436 0.02854691 126 0.334066 0.0110658 0.03505456 162 0.432951 0.0140975 0.0467415 198 0.431905 0.0169763 0.04624726 234 0.312598 0.0111294 0.04353761 270 0.254976 0.00993669 0.02842139 306 0.208087 0.0166134 0.02497514 342 0.195162 0.00818193 0.02292647