CLAS physics database search results Measurement E159M769 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.22683 0.272198 27 2.04914 0.32779 45 1.79647 0.29379 63 1.80796 0.259979 81 1.70643 0.230687 99 2.08472 0.298131 117 2.02361 0.293747 135 1.67121 0.379598 153 1.25262 0.864841 171 1.25416 0.884322