CLAS physics database search results Measurement E159M418 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.33604 0.581279 27 3.3347 0.513594 45 2.78576 0.43711 63 2.54728 0.366952 81 2.16017 0.305583 99 2.60386 0.371166 117 2.46443 0.351567 135 2.40911 0.512959 153 1.68947 1.07919 171 1.95701 1.29846