CLAS physics database search results Measurement E216M251 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 3.06202 0.126871 0.28754793 27 2.51935 0.0571861 0.20968885 45 2.06854 0.0325263 0.16842075 63 1.73267 0.0395191 0.14116889 81 1.69304 0.0343713 0.12313868 99 1.80929 0.0571155 0.12970245 117 1.77133 0.0719157 0.15444169 135 1.61004 0.0467467 0.13933447 153 1.92717 0.0861981 0.22174078 171 1.19045 0.0436632 0.63052319