CLAS physics database search results Measurement E159M802 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.433916 0.0675825 90 0.383272 0.0593871 150 0.40791 0.0647989 210 0.412568 0.0647527 270 0.400721 0.0680819 330 0.3965 0.0637266