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

Bär O, Golterman M (2013)
Physical Review D 87(1).

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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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Bär O, Golterman M. Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions. Physical Review D. 2013;87(1).
Bär, O., & Golterman, M. (2013). Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions. Physical Review D, 87(1).
Bär, O., and Golterman, M. (2013). Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions. Physical Review D 87.
Bär, O., & Golterman, M., 2013. Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions. Physical Review D, 87(1).
O. Bär and M. Golterman, “Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions”, Physical Review D, vol. 87, 2013.
Bär, O., Golterman, M.: Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions. Physical Review D. 87, (2013).
Bär, Oliver, and Golterman, Maarten. “Excited-state contribution to the axial-vector and pseudoscalar correlators with two extra pions”. Physical Review D 87.1 (2013).
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