CLAS physics database search results Measurement E159M427 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.30933 0.55872 27 3.29343 0.500517 45 2.60389 0.403859 63 2.55603 0.377481 81 2.26603 0.324007 99 2.4979 0.355442 117 2.6316 0.387051 135 2.49073 0.519547 153 1.73055 1.11838 171 1.97509 1.31533