CLAS physics database search results Measurement E216M269 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 1.13415 0.162387 0.12593329 27 1.07334 0.0613503 0.08049918 45 0.969412 0.0430582 0.0731222 63 0.759375 0.0273428 0.05849112 81 0.700884 0.0301126 0.05342796 99 0.806142 0.0867245 0.08153981 117 0.744425 0.0275121 0.14939975 135 0.674975 0.0515763 0.2113911 153 0.768707 0.00662142 0.41505217 171 1.12859 0.00496156 0.62557647