CLAS physics database search results Measurement E216M683 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 0.518423 0.048967 0.04480903 27 0.489522 0.0255741 0.03805417 45 0.447197 0.0201962 0.03497755 63 0.506683 0.0195663 0.04014071 81 0.481006 0.0213443 0.03697306 99 0.425701 0.0239634 0.03356855 117 0.436357 0.0279924 0.04258227 135 0.404944 0.0397445 0.06234855 153 0.2785 0.014553 0.1128044 171 0.355089 0.00043514 0.18943855