CLAS physics database search results Measurement E159M550 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.721832 0.0991027 90 0.629955 0.0843245 150 0.827481 0.118509 210 0.81142 0.109689 270 0.791018 0.111751 330 0.650721 0.0853734