CLAS physics database search results Measurement E216M503 CLAS12 Run Group A Krishna Chandra 2018 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 9 1.77985 0.0655114 0.15090404 27 1.54605 0.0361826 0.1175103 45 1.21364 0.0302879 0.09258489 63 1.07111 0.0298243 0.08721299 81 1.05191 0.0317137 0.08057313 99 1.00638 0.031387 0.07316143 117 0.943849 0.037521 0.07700877 135 0.777454 0.02444 0.06883519 153 0.782163 0.0369949 0.10714935 171 0.660084 0.00227477 0.33867794