CLAS physics database search results Measurement E159M715 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.429907 0.140332 27 0.63361 0.125502 45 0.819235 0.138359 63 0.815091 0.142705 81 0.822802 0.115987 99 0.781722 0.12108 117 1.10641 0.170928 135 0.748805 0.229251 153 0.656117 0.425981 171 0.589519 0.505011