CLAS physics database search results Measurement E159M181 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.993173 0.147823 90 1.04931 0.159206 150 1.36085 0.20025 210 1.25504 0.17961 270 1.08267 0.164752 330 1.04857 0.155975