CLAS physics database search results Measurement E159M832 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.05641 0.229879 27 1.19341 0.226441 45 0.986874 0.175177 63 1.32333 0.21985 81 1.17323 0.181784 99 1.18679 0.182128 117 1.23242 0.188219 135 1.34544 0.347224 153 0.90074 0.650068 171 1.01731 0.806745