CLAS physics database search results Measurement E159M649 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.453319 0.0742728 90 0.369983 0.0608434 150 0.499787 0.0749575 210 0.49935 0.0744303 270 0.395203 0.0610613 330 0.419727 0.0665245