CLAS physics database search results Measurement E159M253 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.376545 0.0542224 90 0.365685 0.0499873 150 0.569323 0.074323 210 0.595433 0.0808329 270 0.402801 0.0567874 330 0.403312 0.0568303