CLAS physics database search results Measurement E159M823 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.23981 0.279232 27 1.48068 0.296553 45 1.24122 0.242095 63 1.20336 0.19174 81 1.45711 0.240165 99 1.35815 0.211863 117 1.36966 0.222893 135 1.4237 0.362959 153 0.98697 0.695816 171 1.08766 0.846904