CLAS physics database search results Measurement E159M265 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.0534 0.210238 27 1.76892 0.291128 45 1.85624 0.274634 63 1.78118 0.235465 81 1.98455 0.252027 99 2.00898 0.256982 117 2.23962 0.30106 135 1.49783 0.376057 153 1.32133 0.741626 171 1.30553 0.881167