CLAS physics database search results Measurement E216M458 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 1.21373 0.0555788 0.11026072 27 1.17486 0.0301993 0.09489563 45 1.124 0.0297707 0.09297636 63 1.25259 0.0313519 0.10411201 81 1.37112 0.0348598 0.10396088 99 1.39993 0.0381301 0.10493423 117 1.23351 0.0425974 0.11312209 135 1.08169 0.0487512 0.15015849 153 0.852016 0.0394403 0.24808233 171 0.998209 0.00333433 0.5656239