CLAS physics database search results Measurement E216M473 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.324863 0.00925761 0.03321108 54 0.302307 0.00863713 0.02794825 90 0.336602 0.0126172 0.0296143 126 0.414155 0.0139681 0.03424413 162 0.506307 0.0136198 0.04008836 198 0.520932 0.0145871 0.04113408 234 0.427917 0.0127831 0.03424097 270 0.330207 0.010658 0.02792581 306 0.296291 0.00881089 0.02750387 342 0.323256 0.00814976 0.03327265