CLAS physics database search results Measurement E216M321 CLAS12 Run Group A Krishna Chandra 2018 psi(p) dsigma/dpsi_pr Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.533231 0.0428335 0.08432586 54 0.54178 0.0371863 0.0560896 90 0.50515 0.0207927 0.04164377 126 0.489888 0.0121183 0.03646005 162 0.512737 0.0117901 0.03875085 198 0.503949 0.0120653 0.03897419 234 0.490954 0.0124714 0.03561841 270 0.514766 0.0180224 0.03991542 306 0.584342 0.024183 0.04981049 342 0.489628 0.0273101 0.07453451