CLAS physics database search results Measurement E159M985 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.498135 0.177385 27 0.885315 0.205875 45 1.02037 0.210442 63 1.18289 0.217358 81 1.12327 0.203428 99 1.00339 0.164776 117 1.10724 0.201174 135 1.03904 0.210281 153 0.908203 0.714141 171 0.820167 0.581113