CLAS physics database search results Measurement E216M501 CLAS12 Run Group A Krishna Chandra 2018 psi(p) dsigma/dpsi_pr Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.316654 0.0134322 0.03069236 54 0.352436 0.0159593 0.02841418 90 0.351421 0.0145469 0.02697518 126 0.331451 0.0134817 0.02691275 162 0.344278 0.0096485 0.02637333 198 0.336673 0.00824164 0.02615063 234 0.332145 0.0125366 0.02505234 270 0.329323 0.012171 0.02645056 306 0.344478 0.0123813 0.02791104 342 0.275039 0.0106758 0.02834329