CLAS physics database search results Measurement E216M373 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.33496 0.0158566 0.03418758 54 0.336997 0.0141895 0.02956159 90 0.396512 0.0140862 0.03102888 126 0.484081 0.0153812 0.03606689 162 0.577011 0.0147925 0.04130153 198 0.593564 0.014193 0.0424755 234 0.472957 0.0191354 0.03479951 270 0.422239 0.0167031 0.03576213 306 0.352994 0.0133612 0.0302901 342 0.333943 0.0225194 0.03868056