CLAS physics database search results Measurement E159M652 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.55746 0.286009 27 1.74758 0.30337 45 1.37617 0.231272 63 1.67652 0.286387 81 1.29068 0.19283 99 1.54153 0.231729 117 1.41325 0.21796 135 1.50261 0.393075 153 1.10822 0.767619 171 1.25163 0.940017