CLAS physics database search results Measurement E159M496 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.250576 0.0372562 90 0.292483 0.0462889 150 0.522025 0.0847165 210 0.455237 0.0648011 270 0.300895 0.0479222 330 0.213918 0.0352138