CLAS physics database search results Measurement E159M19 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.301042 0.0520211 90 0.328289 0.0615445 150 0.424408 0.0705002 210 0.471926 0.0838289 270 0.377477 0.0657273 330 0.336368 0.0611266