# 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} }

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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