CLAS physics database search results Measurement E159M841 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error deg mcb/rad mcb/rad 9 0.913288 0.198954 27 1.19092 0.240662 45 1.2649 0.234393 63 1.7199 0.330119 81 1.1411 0.215259 99 1.45668 0.22466 117 1.24424 0.206672 135 1.22029 0.349744 153 0.941684 0.727568 171 1.01304 0.811418