CLAS physics database search results Measurement E159M139 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 2.93372 0.597958 27 4.51686 0.777009 45 4.35792 0.720414 63 4.27877 0.642398 81 4.07524 0.582139 99 4.41104 0.63135 117 3.88104 0.565676 135 3.63809 0.989247 153 1.66688 1.0199 171 1.63397 1.18641