CLAS physics database search results Measurement E216M179 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 2.27984 0.0883055 0.1760787 27 2.23582 0.0520964 0.17887461 45 2.21334 0.0430108 0.1749488 63 2.16229 0.068544 0.16520304 81 2.25787 0.0419686 0.17101973 99 2.20408 0.041792 0.18762204 117 2.11033 0.0669603 0.28247935 135 1.85216 0.0819831 0.31294146 153 1.44775 0.0626495 0.53130575 171 1.86639 0.0161299 1.04541085