CLAS physics database search results Measurement E159M82 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.54934 0.0872401 90 0.576725 0.0938089 150 0.880874 0.130935 210 1.07681 0.16462 270 0.560522 0.0915563 330 0.506407 0.0798844