CLAS physics database search results Measurement E159M778 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.990862 0.212535 27 1.76218 0.289424 45 1.69393 0.281329 63 1.83796 0.276007 81 1.60884 0.217388 99 1.48446 0.201825 117 1.92008 0.268766 135 1.43852 0.406358 153 1.00138 0.648456 171 1.35176 0.955459