CLAS physics database search results Measurement E159M640 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.490838 0.0766636 90 0.410619 0.0642568 150 0.46059 0.0681187 210 0.520918 0.0791108 270 0.401477 0.0650701 330 0.491522 0.0749655