CLAS physics database search results Measurement E159M784 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.457084 0.0713127 90 0.412426 0.0645129 150 0.437159 0.0672906 210 0.420578 0.0628994 270 0.413128 0.0655121 330 0.468579 0.0726628