CLAS physics database search results Measurement E216M188 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 2.72774 0.0872305 0.21641965 27 2.56486 0.0611964 0.21176522 45 2.59128 0.0394241 0.20189363 63 2.64695 0.0384852 0.20253273 81 2.81453 0.0430223 0.21775624 99 2.59625 0.0391368 0.20455839 117 2.57066 0.0530421 0.34308048 135 2.58798 0.182977 0.41874259 153 1.77744 0.0743443 0.64116237 171 2.34211 0.0209567 1.41297946