CLAS physics database search results Measurement E159M949 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error deg mcb/rad mcb/rad 9 0.276677 0.155041 27 0.304299 0.117706 45 0.581516 0.153565 63 0.541709 0.112543 81 0.467235 0.098084 99 0.445491 0.0908843 117 0.513993 0.108108 135 0.531946 0.122148 153 0.382121 0.301682 171 0.320193 0.320947