CLAS physics database search results Measurement E159M153 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.890884 0.126007 90 1.05078 0.151245 150 1.09632 0.153655 210 1.10021 0.154378 270 0.914415 0.127373 330 0.870366 0.123542