CLAS physics database search results Measurement E216M557 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 0.7942 0.0539087 0.06694236 27 0.781292 0.0450009 0.05935473 45 0.703304 0.0239621 0.05731187 63 0.701213 0.0226128 0.05488215 81 0.738852 0.0308311 0.05416737 99 0.771794 0.0392075 0.06527161 117 0.711994 0.0373705 0.06825444 135 0.591403 0.028982 0.11376958 153 0.521402 0.0261233 0.20037211 171 0.65789 0.00177679 0.33441499