CLAS physics database search results Measurement E159M136 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 1.10443 0.16019 90 1.20118 0.177981 150 1.40683 0.202474 210 1.20199 0.170308 270 1.20387 0.180965 330 1.15005 0.172931