CLAS physics database search results Measurement E216M239 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.550085 0.0119672 0.05913948 54 0.479221 0.0109888 0.04641491 90 0.567475 0.0118758 0.04437881 126 0.658434 0.0141134 0.04928691 162 0.882587 0.0232457 0.06639385 198 0.869994 0.0186196 0.06497264 234 0.646025 0.0132484 0.05117359 270 0.512833 0.0114642 0.04206132 306 0.47338 0.0106412 0.04415985 342 0.523579 0.0130577 0.05992586