CLAS physics database search results Measurement E159M370 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.847462 0.117059 90 0.823228 0.116523 150 0.950391 0.133895 210 0.923845 0.128221 270 0.790732 0.112254 330 0.728639 0.100385