CLAS physics database search results Measurement E159M793 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.416839 0.0665911 90 0.388519 0.0601147 150 0.447333 0.0691892 210 0.419476 0.0645104 270 0.383216 0.0637475 330 0.380121 0.0583511