CLAS physics database search results Measurement E159M199 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 1.05764 0.161026 90 0.993262 0.151861 150 1.29078 0.19266 210 1.27673 0.194984 270 0.872561 0.129633 330 1.24997 0.197116