CLAS physics database search results Measurement E159M814 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.999479 0.231844 27 1.17146 0.215981 45 1.17752 0.218811 63 1.26647 0.21186 81 1.2456 0.195088 99 1.17695 0.17612 117 1.09782 0.168102 135 1.03698 0.342894 153 0.91304 0.685392 171 1.02111 0.797345