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Multi-Pion Systems in Lattice QCD and the Three-Pion Interaction

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arxiv 0710.1827 v1 pith:MNGF3ZV6 submitted 2007-10-09 hep-lat hep-phnucl-th

Multi-Pion Systems in Lattice QCD and the Three-Pion Interaction

classification hep-lat hep-phnucl-th
keywords energiesground-stateinteractionthree-combinationslatticeagreementcalculations
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The ground-state energies of 2, 3, 4 and 5 \pi^+'s in a spatial volume V (2.5 fm)^3 are computed with lattice QCD. By eliminating the leading contribution from three-\pi^+ interactions, particular combinations of these n-\pi^+ ground-state energies provide precise extractions of the \pi^+\pi^+ scattering length in agreement with that obtained from calculations involving only two \pi^+'s. The three-\pi^+ interaction can be isolated by forming other combinations of the n-\pi^+ ground-state energies. We find a result that is consistent with a repulsive three-\pi^+ interaction for m_\pi < 352 MeV.

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Cited by 3 Pith papers

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  1. Higher order quantization conditions for two-body scattering with spin

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    Higher-order finite-volume quantization conditions for spin-1/2 + spin-0 scattering are derived to J=11/2 and numerically checked to agree with independent box spectra to six significant figures.

  2. Coupled-channel approach to isotensor $\pi\pi\pi$ scattering from lattice QCD

    hep-lat 2026-01 conditional novelty 6.0

    The I=2 three-pion spectrum from lattice QCD is described by a repulsive rho-pi S-wave interaction, consistent with a leading-order effective Lagrangian.

  3. Minimal superfluid vortices in chiral perturbation theory

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    Leading order chiral perturbation theory yields the minimal energy condition for vortex nucleation in the pion condensed phase, with vortices carrying quantized angular momentum and self-confining pions.