CLAS physics database search results Measurement E159M91 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.626443 0.0960345 90 0.706405 0.104791 150 1.01902 0.148148 210 1.11497 0.166771 270 0.790637 0.122261 330 0.725794 0.111874