CLAS physics database search results Measurement E216M737 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 0.739472 0.0511091 0.05808945 27 0.584589 0.0272913 0.04526794 45 0.559746 0.0189825 0.04012463 63 0.507163 0.0206914 0.03724022 81 0.499081 0.034153 0.03901852 99 0.518952 0.0276039 0.03764746 117 0.467723 0.0184838 0.03461079 135 0.342331 0.019269 0.03356761 153 0.242918 0.0272235 0.04346292 171 0.26035 0.00048723 0.13762182