CLAS physics database search results Measurement E216M913 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0288653 0.00559883 0.0055218 54 0.026668 0.007162 0.00544984 90 0.028911 0.00480177 0.003693 126 0.0309648 0.00487711 0.0035225 162 0.0347908 0.0109239 0.00434949 198 0.0404666 0.0058085 0.00469693 234 0.0397654 0.00579724 0.00490768 270 0.0316884 0.0115911 0.00393988 306 0.0247869 0.00932695 0.00508092 342 0.0255436 0.0060676 0.00501128