CLAS physics database search results Measurement E216M980 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 0.312763 0.0478545 0.02767175 27 0.301721 0.0278075 0.02439646 45 0.289446 0.0421092 0.0234244 63 0.271664 0.0194252 0.02300221 81 0.300163 0.0256695 0.02762427 99 0.301643 0.0286987 0.02903915 117 0.253771 0.0298547 0.0438821 135 0.169171 0.0316791 0.02267966 153 0.0882916 0.0131186 0.02997156 171 0.123277 0.00011985 0.06320147