CLAS physics database search results Measurement E159M787 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.01099 0.240583 27 1.94254 0.363617 45 1.35192 0.246676 63 1.44528 0.214653 81 1.68238 0.261197 99 1.42743 0.215873 117 1.57803 0.238156 135 1.27401 0.375817 153 0.863522 0.585228 171 1.20481 0.882831