CLAS physics database search results Measurement E216M989 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 0.458527 0.0674801 0.04269171 27 0.309255 0.0260157 0.0296869 45 0.25802 0.0318686 0.02665975 63 0.253106 0.0196215 0.0243201 81 0.249471 0.0185713 0.02886976 99 0.224287 0.0228467 0.0215845 117 0.147186 0.0266351 0.02070292 135 0.17131 0.0411904 0.02235799 153 0.0930312 0.0129305 0.02632687 171 0.125959 0.00012124 0.06529072