CLAS physics database search results Measurement E159M625 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.43863 0.282086 27 1.53855 0.264314 45 1.58338 0.270265 63 1.81516 0.271199 81 1.67293 0.247662 99 1.66206 0.246229 117 1.92911 0.287448 135 1.62131 0.420006 153 1.3611 0.908408 171 1.33872 1.00016