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arXiv · 2401.14293

The three-pion $K$-matrix at NLO in ChPT

Jorge Baeza-Ballesteros·Johan Bijnens·Tomáš Husek·Fernando Romero-López·Stephen R. Sharpe·Mattias Sjö
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Abstract

The three-particle $K$-matrix, $\mathcal{K}_{\mathrm{df},3}$, is a scheme-dependent quantity that parametrizes short-range three-particle interactions in the relativistic-field-theory three-particle finite-volume formalism. In this work, we compute its value for systems of three pions in all isospin channels through next-to-leading order in Chiral Perturbation Theory, generalizing previous work done at maximum isospin. We obtain analytic expressions through quadratic order (or cubic order, in the case of zero isospin) in the expansion about the three-pion threshold.

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Jorge Baeza-Ballesteros, Johan Bijnens, Tomáš Husek, Fernando Romero-López, Stephen R. Sharpe, Mattias Sjö. 2024-01-25. The three-pion $K$-matrix at NLO in ChPT. https://doi.org/10.1007/jhep03(2024)048

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