CLAS physics database search results Measurement E159M64 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.478094 0.077026 90 0.620904 0.0957657 150 0.866111 0.141054 210 0.916141 0.139895 270 0.662496 0.106397 330 0.466984 0.0725558