CLAS physics database search results Measurement E159M796 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.15186 0.252267 27 1.19697 0.212693 45 1.19311 0.211867 63 1.44906 0.235056 81 1.52694 0.237149 99 1.43999 0.220552 117 1.46322 0.227867 135 1.37712 0.363565 153 0.822199 0.602191 171 1.13072 0.851344