CLAS physics database search results Measurement E159M829 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Stat. error deg mcb/rad mcb/rad 30 0.378405 0.0604721 90 0.309506 0.0476708 150 0.342423 0.0530471 210 0.396641 0.0611974 270 0.342182 0.0568307 330 0.340602 0.0559359