CLAS physics database search results Measurement E159M238 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.371123 0.126469 27 0.914429 0.151528 45 0.90936 0.128262 63 0.894268 0.12363 81 1.0715 0.138943 99 1.10368 0.157905 117 0.74888 0.108303 135 0.692488 0.224532 153 0.703297 0.418206 171 0.610232 0.494278