CLAS physics database search results Measurement E216M491 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.284232 0.00773861 0.02767194 54 0.248084 0.0105863 0.0221654 90 0.312531 0.00946108 0.02386501 126 0.374862 0.0117173 0.0293415 162 0.476533 0.014027 0.03569509 198 0.458695 0.0181657 0.03513261 234 0.387436 0.0135225 0.02938164 270 0.291988 0.00874861 0.02247003 306 0.271636 0.0112736 0.02331251 342 0.273466 0.00841263 0.02744243