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  • Open Access

Subthreshold parameters of ππ scattering revisited

Marián Kolesár* and Jaroslav Říha†

  • Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic

  • *Contact author: marian.kolesar@matfyz.cuni.cz
  • †Contact author: jaroslav.riha@matfyz.cuni.cz
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Phys. Rev. D 113, 034015 – Published 12 February, 2026

DOI: https://doi.org/10.1103/rjyj-ht9g

Abstract

Using a variety of experimental results and lattice QCD calculations of ππ scattering lengths, while employing dispersive representations of the amplitude based on Roy equations, we compute the subthreshold parameters of this process. We use Monte Carlo sampling to numerically model the probability distribution of the results based on all uncertainties in the inputs. We also investigate the dependence of the results on a theoretical correlation between the ππ scattering lengths a00 and a02, which was previously established in the framework of two-flavor χPT.

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Information

Phys. Rev. D 113, 034015– Published 12 February, 2026
  • Received 12 August 2025
  • Accepted 9 January 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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