CLAS physics database search results Measurement E216M836 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 0.285717 0.0380132 0.02494378 27 0.348477 0.0260275 0.0280332 45 0.325378 0.0178273 0.0259356 63 0.321837 0.0161708 0.0271405 81 0.353838 0.0184372 0.02879359 99 0.354195 0.0212335 0.02859345 117 0.334381 0.0242496 0.02834402 135 0.252362 0.0426961 0.03743199 153 0.185817 0.0196228 0.06108897 171 0.198394 0.00018702 0.10592496