CLAS physics database search results Measurement E159M595 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.438988 0.067088 90 0.472228 0.0741365 150 0.468906 0.0692212 210 0.574768 0.0862485 270 0.401289 0.0609721 330 0.520059 0.0777322