CLAS physics database search results Measurement E159M811 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.333766 0.0539557 90 0.343906 0.0599375 150 0.33362 0.0503983 210 0.36961 0.0558001 270 0.302868 0.0494866 330 0.364575 0.055948