CLAS physics database search results Measurement E159M148 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 2.80144 0.603656 27 3.81434 0.644805 45 3.53208 0.590469 63 3.42885 0.524503 81 4.21145 0.625412 99 4.16465 0.604175 117 4.01195 0.602301 135 3.27695 0.989247 153 1.69059 1.0431 171 1.60724 1.17618