CLAS physics database search results Measurement E159M676 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.123898 0.0206212 90 0.119462 0.0200444 150 0.154345 0.0221874 210 0.160337 0.0229483 270 0.11083 0.019855 330 0.113422 0.0203516