CLAS physics database search results Measurement E159M505 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.225248 0.0338919 90 0.281833 0.0449514 150 0.446992 0.06799 210 0.453506 0.0646674 270 0.30467 0.0483158 330 0.212836 0.0332501