CLAS physics database search results Measurement E159M517 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.894264 0.237397 27 1.33045 0.24727 45 1.43093 0.257494 63 1.15425 0.176297 81 1.32095 0.200035 99 1.38277 0.204249 117 1.48619 0.223428 135 1.2997 0.271954 153 0.841022 0.763483 171 0.713592 0.603651