CLAS physics database search results Measurement E216M449 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 1.22346 0.0578267 0.09625415 27 1.177 0.0398366 0.09491746 45 1.12513 0.0323831 0.08685824 63 1.26848 0.0289847 0.09599991 81 1.33926 0.0287339 0.09819949 99 1.39943 0.0427952 0.10384558 117 1.21091 0.0302017 0.11119853 135 1.1044 0.0700129 0.18589971 153 0.896871 0.0426905 0.30782821 171 1.11085 0.00328123 0.62754788