CLAS physics database search results Measurement E159M751 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.683848 0.175396 27 1.18311 0.218947 45 0.973132 0.169378 63 1.17676 0.190476 81 1.09653 0.17289 99 1.37078 0.204723 117 1.3696 0.227455 135 1.2331 0.255255 153 0.620641 0.416092 171 0.670516 0.567339