CLAS physics database search results Measurement E216M143 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 1.62793 0.171086 0.18617082 27 1.45252 0.0607115 0.11877346 45 1.26369 0.0417005 0.09835991 63 1.17751 0.0339294 0.09119855 81 1.07907 0.0317808 0.08946143 99 1.06744 0.033297 0.12278024 117 1.12063 0.0261754 0.25853761 135 0.933708 0.0372123 0.31332061 153 1.12724 0.0604322 0.60238259 171 1.63693 0.0080302 0.92221054