CLAS physics database search results Measurement E159M742 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.759217 0.187377 27 0.795841 0.148878 45 0.672136 0.124608 63 0.993728 0.156776 81 1.06043 0.160467 99 0.922973 0.150449 117 0.874172 0.135493 135 0.999516 0.213058 153 0.721651 0.606011 171 0.524646 0.468269