CLAS physics database search results Measurement E216M563 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.283187 0.0192424 0.02926558 54 0.287354 0.0209761 0.02689076 90 0.282398 0.00974012 0.02654299 126 0.328623 0.0131505 0.02947647 162 0.335834 0.0201467 0.03111994 198 0.354747 0.0161406 0.03816837 234 0.322768 0.0124985 0.03354267 270 0.280548 0.010502 0.02685286 306 0.252997 0.00833655 0.02506492 342 0.25851 0.00962621 0.02638707