CLAS physics database search results Measurement E159M409 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.2527 0.542926 27 3.39737 0.527742 45 2.71857 0.423769 63 2.40839 0.344909 81 2.5287 0.364624 99 2.85011 0.397466 117 2.93162 0.424115 135 2.28992 0.529474 153 1.95855 1.22889 171 2.03421 1.34153