CLAS physics database search results Measurement E216M881 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 0.561449 0.0536053 0.05392349 27 0.426887 0.0262349 0.03255274 45 0.354099 0.0278162 0.02721833 63 0.310598 0.0165075 0.0277218 81 0.27894 0.0165558 0.02464361 99 0.238299 0.0148551 0.02471023 117 0.183407 0.0294414 0.02251862 135 0.181959 0.0222706 0.02089696 153 0.0998235 0.0326287 0.02689829 171 0.138155 0.00015554 0.07811887