CLAS physics database search results Measurement E159M760 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.977787 0.223046 27 1.06358 0.174039 45 1.33626 0.214176 63 1.33331 0.197505 81 1.34348 0.189333 99 1.51943 0.22581 117 1.27604 0.187215 135 1.23962 0.276881 153 0.830665 0.572982 171 0.801961 0.625666