CLAS physics database search results Measurement E159M40 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.991325 0.288275 27 1.84108 0.335463 45 1.898 0.302469 63 2.21618 0.347337 81 2.08341 0.297417 99 2.50364 0.379786 117 2.12571 0.333421 135 1.07782 0.989247 153 0.977863 0.73526 171 0.96406 1.06599