CLAS physics database search results Measurement E216M719 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 0.561685 0.0399236 0.04816757 27 0.577501 0.0237133 0.04544351 45 0.534829 0.0191481 0.04335728 63 0.49163 0.0236972 0.04006907 81 0.55736 0.0250434 0.04357284 99 0.593476 0.0271097 0.0500727 117 0.504469 0.0216111 0.03855961 135 0.38931 0.0225061 0.0409242 153 0.294104 0.034427 0.06224725 171 0.259579 0.00035048 0.13514337