CLAS physics database search results Measurement E216M512 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 0.450514 0.0820773 0.05105062 27 0.387585 0.038 0.03235398 45 0.333168 0.0269719 0.02904642 63 0.344809 0.0224268 0.02868554 81 0.273711 0.0286718 0.03461069 99 0.236766 0.0201566 0.01985561 117 0.282465 0.0312873 0.04418042 135 0.215457 0.021866 0.07371213 153 0.294218 0.00149968 0.15496315 171 0.361231 0.00033466 0.18666455