The Gauge Theory Bootstrap: Predicting pion dynamics from QCD
Abstract
The Gauge Theory Bootstrap [arXiv:2309.12402, arXiv:2403.10772] computes the strongly coupled pion dynamics by considering the most general scattering matrix, form factors and spectral densities and matching them with perturbative QCD at high energy and with weakly coupled pions at low energy. In this work, we show that further constraints on the spectral densities significantly reduce the possible solutions to a small set of qualitatively similar ones. Quantitatively, the precise solution is controlled by the asymptotic value of the form factors and SVZ sum rules. We also introduce an iterative procedure that, starting from a generic feasible point, converges to a unique solution parameterized by the UV input. For the converged solution we compute masses and widths of resonances that appear, scattering lengths and effective ranges of partial waves, low energy coefficients in the effective action. Additionally, we use these results to discuss the thermodynamics of a pion gas including pair correlations of pions with same and opposite charge.
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BibTeX
@article{he2026gauge,
title = {{The Gauge Theory Bootstrap: Predicting pion dynamics from QCD}},
author = {Yifei He and Martin Kruczenski},
journal = {Progress of Theoretical and Experimental Physics [PTEP]},
year = {2026},
month = sep,
doi = {10.1093/ptep/ptag087},
eprint = {2505.19332},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05097394v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - The Gauge Theory Bootstrap: Predicting pion dynamics from QCD
AU - Yifei He
AU - Martin Kruczenski
PY - 2026
DA - 2026/09/22
JO - Progress of Theoretical and Experimental Physics [PTEP]
DO - 10.1093/ptep/ptag087
UR - https://hal.science/hal-05097394v1
AB - The Gauge Theory Bootstrap [arXiv:2309.12402, arXiv:2403.10772] computes the strongly coupled pion dynamics by considering the most general scattering matrix, form factors and spectral densities and matching them with perturbative QCD at high energy and with weakly coupled pions at low energy. In this work, we show that further constraints on the spectral densities significantly reduce the possible solutions to a small set of qualitatively similar ones. Quantitatively, the precise solution is controlled by the asymptotic value of the form factors and SVZ sum rules. We also introduce an iterative procedure that, starting from a generic feasible point, converges to a unique solution parameterized by the UV input. For the converged solution we compute masses and widths of resonances that appear, scattering lengths and effective ranges of partial waves, low energy coefficients in the effective action. Additionally, we use these results to discuss the thermodynamics of a pion gas including pair correlations of pions with same and opposite charge.
SN - 2050-3911
ER -