CLAS physics database search results Measurement E159M247 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.48144 0.196591 27 0.936921 0.159754 45 1.24481 0.184369 63 1.3195 0.178323 81 1.36629 0.177949 99 1.37046 0.183515 117 1.0868 0.159429 135 0.842137 0.266647 153 0.888153 0.511864 171 0.805882 0.600638