CLAS physics database search results Measurement E159M724 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.395011 0.124719 27 0.83127 0.184342 45 0.719603 0.118509 63 0.765491 0.130918 81 0.662553 0.103206 99 0.722275 0.113226 117 0.842819 0.134351 135 0.938263 0.207972 153 0.504237 0.339961 171 0.502903 0.454282