CLAS physics database search results Measurement E159M805 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.902144 0.203545 27 1.12447 0.222352 45 1.51776 0.271302 63 1.45054 0.228857 81 1.43719 0.228991 99 1.35223 0.211845 117 1.56556 0.244822 135 1.25341 0.375405 153 0.906455 0.651906 171 1.15499 0.878793