CLAS physics database search results Measurement E216M575 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 0.855103 0.0604823 0.07792055 27 0.751387 0.0298915 0.05768564 45 0.766073 0.0274769 0.05661984 63 0.822152 0.0231806 0.06240966 81 0.87344 0.0257014 0.06277485 99 0.956272 0.0287346 0.07013462 117 0.811803 0.0276572 0.06880477 135 0.523928 0.132965 0.09855898 153 0.483091 0.0271676 0.19288063 171 0.652075 0.00184311 0.34450722