CLAS physics database search results Measurement E159M274 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.3994 0.310049 27 1.44666 0.213102 45 1.65194 0.264756 63 1.42766 0.191395 81 1.61772 0.208112 99 1.80328 0.231068 117 1.7069 0.231489 135 1.77665 0.324062 153 1.19204 0.684214 171 1.13697 0.764096