CLAS physics database search results Measurement E159M865 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.329275 0.0583553 90 0.333615 0.0568476 150 0.366224 0.0618159 210 0.404381 0.063157 270 0.281498 0.0464064 330 0.288827 0.0496673