CLAS physics database search results Measurement E159M562 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error deg mcb/rad mcb/rad 9 1.76253 0.417168 27 2.61 0.415324 45 2.73923 0.473682 63 2.15837 0.300484 81 2.41436 0.333003 99 2.5837 0.36444 117 2.41517 0.32743 135 1.84719 0.476548 153 1.46812 0.962494 171 1.64652 1.13201