CLAS physics database search results Measurement E159M1057 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.556177 0.173743 27 0.817181 0.211766 45 0.784504 0.208558 63 0.785673 0.165706 81 0.676529 0.146268 99 0.86225 0.181989 117 0.965003 0.230358 135 0.707493 0.193087 153 0.647869 0.523771 171 0.640086 0.529336