CLAS physics database search results Measurement E216M455 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.348461 0.0150146 0.03833207 54 0.312331 0.0141794 0.0355035 90 0.36313 0.0104269 0.03404594 126 0.425441 0.0130918 0.03852392 162 0.490693 0.0195688 0.04072815 198 0.481023 0.0132001 0.04099604 234 0.390877 0.01176 0.03546272 270 0.361659 0.0112233 0.0344161 306 0.335912 0.0108184 0.0347563 342 0.345457 0.00968803 0.03767217