CLAS physics database search results Measurement E159M586 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.490197 0.073021 90 0.457287 0.0691212 150 0.543852 0.0805404 210 0.552845 0.0817472 270 0.506616 0.0760619 330 0.457826 0.069221