Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions

@article{Bar2013ExcitedstateCT,
  title={Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions},
  author={O. Bar and M. Golterman},
  journal={Physical Review D},
  year={2013},
  volume={87},
  pages={014505}
}
  • O. Bar, M. Golterman
  • Published 2013
  • Physics
  • Physical Review D
  • We study multi-particle state contributions to the QCD two-point functions of the axial-vector and pseudo-scalar quark bilinears in a finite spatial volume. For sufficiently small quark masses one expects three-meson states with two additional pions at rest to have the lowest total energy after the ground state. We calculate this three-meson state contribution using chiral perturbation theory. We find it to be strongly suppressed and too small to be seen in present-day lattice simulations. 
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