CLAS physics database search results Measurement E159M298 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.436747 0.0612034 90 0.459238 0.0638547 150 0.76141 0.102884 210 0.703502 0.0940887 270 0.444055 0.0623609 330 0.420712 0.0590279