CLAS physics database search results Measurement E159M463 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.29331 0.113866 27 0.84291 0.211959 45 0.898162 0.148166 63 0.674846 0.113627 81 0.798211 0.1088 99 0.929518 0.136671 117 0.69759 0.109209 135 0.540365 0.207093 153 0.486909 0.331282 171 0.451596 0.442135