CLAS physics database search results Measurement E216M647 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 0.343215 0.0611243 0.03948614 27 0.321262 0.0330176 0.03224551 45 0.319349 0.0230384 0.02862724 63 0.28724 0.0201362 0.02367239 81 0.197437 0.0211748 0.0174119 99 0.199916 0.0203711 0.01634411 117 0.276856 0.0939635 0.07117472 135 0.208663 0.0348837 0.06444577 153 0.245948 0.0190741 0.11998706 171 0.325418 0.00028369 0.17077204