The sigma meson (f0) at finite temperature with truncated overlap fermions
Abstract
We study the temperature dependence of meson screening masses in two-flavour lattice QCD using dynamical truncated overlap fermions, a type of lattice chiral fermions. The screening masses for the π, ρ, a1, a0, and the sigma (f0) mesons are extracted by computing spatial correlation functions. This exploratory study uses meson screening masses and the connected/disconnected decomposition of the scalar correlator as diagnostic observables to examine how the disconnected contribution changes across the pseudocritical region. Above the pseudocritical temperature Tpc, the π and f0 screening masses become degenerate, consistent with chiral restoration. The (ρ,a1) pair also shows the expected degeneracy. Decomposition of the f0 propagator reveals that the connected contribution dominates above Tpc, while the disconnected part becomes significant below Tpc, explaining the reduced statistical clarity observed at low T. These results demonstrate that dynamical truncated overlap fermion simulations can capture the qualitative thermal behaviour of the scalar sector.
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BibTeX
@misc{date2026sigma,
title = {{The sigma meson ($f_0$) at finite temperature with truncated overlap fermions}},
author = {S. Date and Y. Murakami and M. Sekiguchi and H. Wada and M. Wakayama},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2605.07126},
eprint = {2605.07126},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.07126},
}
RIS
TY - UNPB
TI - The sigma meson (f_0) at finite temperature with truncated overlap fermions
AU - S. Date
AU - Y. Murakami
AU - M. Sekiguchi
AU - H. Wada
AU - M. Wakayama
PY - 2026
DA - 2026/10/02
PB - arXiv
DO - 10.48550/arxiv.2605.07126
UR - https://arxiv.org/abs/2605.07126
AB - We study the temperature dependence of meson screening masses in two-flavour lattice QCD using dynamical truncated overlap fermions, a type of lattice chiral fermions. The screening masses for the π, ρ, a_1, a_0, and the sigma (f_0) mesons are extracted by computing spatial correlation functions. This exploratory study uses meson screening masses and the connected/disconnected decomposition of the scalar correlator as diagnostic observables to examine how the disconnected contribution changes across the pseudocritical region. Above the pseudocritical temperature T_pc, the π and f_0 screening masses become degenerate, consistent with chiral restoration. The (ρ,a_1) pair also shows the expected degeneracy. Decomposition of the f_0 propagator reveals that the connected contribution dominates above T_pc, while the disconnected part becomes significant below T_pc, explaining the reduced statistical clarity observed at low T. These results demonstrate that dynamical truncated overlap fermion simulations can capture the qualitative thermal behaviour of the scalar sector.
ER -