CLAS physics database search results Measurement E159M499 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.91698 0.281277 27 1.21069 0.2932 45 1.01116 0.161967 63 1.08027 0.171317 81 1.11595 0.160175 99 1.19468 0.209029 117 1.39396 0.215347 135 1.11286 0.225283 153 0.639111 0.462703 171 0.552064 0.492258