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arXiv · 2510.24894

Isotensor $πππ$ scattering with a $ρ$ resonant subsystem from QCD

Raúl A. Briceño·Maxwell T. Hansen·Andrew W. Jackura·Robert G. Edwards·Christopher E. Thomas
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Abstract

This work presents a lattice quantum chromodynamics (QCD) determination of $πππ$ scattering amplitudes for the isospin-2 channel with angular momentum and parity $J^{P} = 1^+$. The calculation is performed using unphysically heavy light-quark masses, corresponding to a pion mass of $m_π \approx 400$~MeV, for which the $ρ$ meson manifests as a narrow resonance. The analysis employs a previously developed formalism that non-perturbatively relates the finite-volume spectra of two- and three-pion systems to their infinite-volume scattering amplitudes. We combine earlier lattice QCD results for $ππ$ systems with isospins 1 and 2 with new determinations of the isospin-2 three-pion finite-volume spectrum, obtained for three cubic, periodic lattice volumes with box length ranging from $\approx 4/m_π$ to $6/m_π$. These combined data constrain the low-lying partial waves of the infinite-volume three-pion K matrix, from which we solve a set of coupled integral equations to extract the corresponding scattering amplitudes.

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Raúl A. Briceño, Maxwell T. Hansen, Andrew W. Jackura, Robert G. Edwards, Christopher E. Thomas. 2025-11-18. Isotensor $πππ$ scattering with a $ρ$ resonant subsystem from QCD. https://arxiv.org/abs/2510.24894

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