CLAS physics database search results Measurement E159M289 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.375278 0.0514559 90 0.476005 0.0681783 150 0.781939 0.105962 210 0.731573 0.101801 270 0.445167 0.063441 330 0.350062 0.0487229