CLAS physics database search results Measurement E216M539 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 0.517686 0.0550606 0.04942984 27 0.47729 0.0294147 0.03692415 45 0.433144 0.0220994 0.03314834 63 0.440529 0.0188867 0.03831481 81 0.423326 0.0179528 0.03199938 99 0.420193 0.0212544 0.03313799 117 0.408845 0.0227571 0.03981283 135 0.435812 0.0448975 0.08766709 153 0.306391 0.0184638 0.14510357 171 0.449513 0.00064161 0.24785968