CLAS physics database search results Measurement E159M166 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.40303 0.64603 27 3.64 0.591851 45 3.41604 0.579704 63 3.6032 0.527397 81 3.71946 0.556887 99 3.9673 0.585403 117 3.92769 0.582976 135 3.74533 0.989247 153 1.9392 1.19504 171 1.72055 1.24093