CLAS physics database search results Measurement E159M397 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.744816 0.105964 90 0.781217 0.111236 150 0.989649 0.142224 210 0.945424 0.132774 270 0.803701 0.123879 330 0.765258 0.107112