PaperPanorama

HEP Lattice·hep-lat

Wed·Sep 30, 2026

3 papers—2 primary·1 cross-listed

All3Primary2Cross-lists1
  1. 01

    A parameter independent analysis of the QCD chiral phase transition and its universal critical behaviour

    Jishnu Goswami · Frithjof Karsch · Sabarnya Mitra · Christian Schmidt

    We make use of unique properties of scaling functions to estimate the chiral phase transition temperature and corresponding universal critical parameters of this phase transition directly from (2+1)-flavor QCD simulations with highly improved staggered fermions on lattices with temporal extent . Working with an improved chiral order parameter for quantifying chiral symmetry breaking, we analyze the finite-volume dependence of this observable for a wide range of lattice volumes and light quark masses, and quantitatively estimate the deviations from the expected universal scaling behaviour as a function of the light-to-strange quark mass ratio.

    hep-lathep-phhep-thnucl-ex+1
  2. 02

    Subtraction method for disconnected diagrams in full QCD

    Lorenzo Barca · Joshua Crawford · Jacob Finkenrath · Stefan Schaefer · Juan Andrés Urrea-Niño

    Disconnected diagrams remain a major challenge for precision lattice QCD calculations because of their large statistical fluctuations. We investigate a subtraction method based on a domain decomposition of the Dirac operator, yielding a biased but substantially less noisy estimator. Applying the method to charmonium disconnected correlators computed using distillation, we achieve a variance reduction of about three orders of magnitude at only twice the computational cost, providing a practical alternative to completely neglecting disconnected contributions.

    hep-lat
  3. 03

    Vector Meson Dominance and Vector Meson Production

    Craig D. Roberts

    Against a background supported by the three pillars of emergent mass, this contribution challenges the fidelity of vector meson dominance as an instrument for relating the electromagnetic vector-meson (V) production reaction to the hadronic process . It also describes a viable reaction model for exclusive photoproduction of light and heavy vector mesons from the proton, which exposes the content of the photon. That model's successes reveal that it is premature to link extant data with, for instance, in-proton gluon distributions, the QCD trace anomaly, or pentaquark production. Improved reaction theory and more precise data are required before the validity of such links can objectively be assessed.

    ↳ hep-phhep-exhep-latnucl-ex+1