CLAS physics database search results Measurement E159M868 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.07151 0.232752 27 0.978785 0.176967 45 1.32634 0.244172 63 1.26381 0.219822 81 1.19452 0.199442 99 0.988191 0.160492 117 1.14835 0.195979 135 1.0454 0.333433 153 0.878951 0.641845 171 0.93393 0.769809