CLAS physics database search results Measurement E159M121 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.7411 0.745121 27 4.53143 0.720765 45 4.02866 0.612793 63 5.09517 0.694699 81 4.97602 0.666096 99 5.44456 0.740613 117 4.69531 0.649164 135 3.49466 0.989247 153 1.79375 1.04644 171 1.76205 1.2417