CLAS physics database search results Measurement E159M145 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 1.0204 0.155748 90 0.977809 0.145566 150 1.22413 0.173654 210 1.26797 0.189073 270 1.08753 0.165356 330 1.1251 0.169558