CLAS physics database search results Measurement E159M859 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.204 0.252907 27 0.947587 0.179633 45 1.03917 0.185178 63 1.2973 0.226425 81 1.20341 0.202742 99 1.17977 0.202887 117 1.04991 0.181775 135 1.18017 0.33322 153 0.988648 0.760464 171 0.940038 0.76988