CLAS physics database search results Measurement E159M481 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.747563 0.206175 27 1.49196 0.271242 45 1.40256 0.290565 63 1.30357 0.218257 81 1.25144 0.184145 99 1.47826 0.214194 117 1.24245 0.183106 135 0.98989 0.256383 153 0.61666 0.406303 171 0.627002 0.557989