CLAS physics database search results Measurement E159M777 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.21473 0.258411 27 1.31574 0.222185 45 1.80451 0.276673 63 1.45728 0.213181 81 1.57303 0.245539 99 1.40514 0.211622 117 1.57788 0.245623 135 1.79469 0.276941 153 1.83673 0.31262 171 1.44491 0.295316