CLAS physics database search results Measurement E216M323 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 1.65861 0.0685046 0.12872068 27 1.5524 0.0414428 0.12360655 45 1.77236 0.0379634 0.13646811 63 1.75819 0.0349022 0.12952892 81 1.89705 0.0503058 0.13681575 99 1.90957 0.0419886 0.13772714 117 1.5883 0.0446048 0.14844744 135 1.51471 0.0499714 0.21286535 153 1.11453 0.0457665 0.34631981 171 1.34832 0.0105769 0.76390636