PaperPanorama

HEP Lattice·hep-lat

Thu·Jul 2, 2026

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    Monte Carlo reconstruction of symmetry-twisted partition function ratios: the critical 3D Ising

    José Matos🇵🇹

    We introduce a Monte Carlo strategy for directly estimating partition function ratios between distinct global sectors of a lattice theory. It enlarges the configuration space to sample an interpolating family whose endpoints are the desired sectors, and uses flat histogram methods to reconstruct the corresponding free energy difference. Although the construction is more general, we focus here on the three-dimensional Ising model on the slab at the bulk critical point, comparing the untwisted periodic sector with the -twisted antiperiodic sector. A large-volume and aspect ratio extrapolation gives the symmetry-twisted thermodynamic Casimir difference directly, without lattice derivatives or bulk subtractions. This provides an independent twisted sector probe of tensions observed in periodic sector thermodynamic Casimir observables. More generally, the method gives direct but selective numerical access to CFT compactification data, including estimates of the effective thermal screening scale and the -odd sector energy gap on .

    hep-latcond-mat.stat-mechhep-th0 citations
  2. 02

    Gradient Flow Renormalization Schemes for Composite Fermion Operators

    Matthew Black🇬🇧 · Anna Hasenfratz🇺🇸 · Oliver Witzel🇩🇪

    We introduce gradient flow (GF) normalization prescriptions for fermionic composite operators in which the flowed fermion wavefunction renormalization factor is fixed nonperturbatively using either the partially conserved axial charge or the conserved vector current. The resulting and schemes are defined through standard flowed two-point correlation functions and therefore avoid the backward-flow construction required by local ringed-scheme definitions. In the short-flow-time limit, the and schemes can be matched to using known ringed-scheme short-flow-time expansion (SFTX) coefficients. We show how these schemes can be implemented through ratios of two-point correlation functions, leading to simple nonperturbative determinations of renormalization factors, anomalous dimensions, and evolution factors which connect lattice-accessible flow times to shorter flow times where perturbative matching is reliable. We illustrate the method with RBC-UKQCD domain-wall fermion ensembles, including a GF determination of the ratio of matching factors , and a new GF determination of the renormalized strange quark mass.

    hep-lathep-ph0 citations
  3. 03

    Isospin-breaking effects in inclusive hadronic data for the muon from first principles

    Mattia Bruno🇮🇹 · Taku Izubuchi🇺🇸 · Christoph Lehner🇩🇪 · Aaron S. Meyer🇺🇸 · Julian Parrino🇩🇪 · Xin-Yu Tuo🇺🇸

    The knowledge of isospin-breaking effects in hadronic decays is required for a high-precision determination of the Hadronic-Vacuum-Polarization contribution to from experimental data. In this work we present a strategy for their calculation in a fully inclusive setup from first-principles Lattice QCD+QED simulations. We separate radiative corrections in three infrared safe classes, which we study individually. We provide analytic expressions for their effects in the initial state and propose a strategy for final-state corrections directly in Euclidean space. We also examine the non-factorizable contributions and highlight the challenges associated with their analytic continuation from Euclidean to Minkowski space. By studying short-distance corrections in the context of momentum schemes, we provide a prescription for the renormalization of the individual terms at first order in the ispospin-breaking parameters.

    hep-lathep-ph1 citation
  4. 04

    Inclusive decays from lattice QCD: computational strategy and a first physical result

    Alessandro De Santis🇩🇪 · Antonio Evangelista🇨🇾 · Gael Finauri🇮🇹 · Roberto Frezzotti🇮🇹 · Giuseppe Gagliardi🇮🇹 · Paolo Gambino🇮🇹 · Marco Garofalo🇩🇪 · Christiane Franziska Groß🇩🇪 · Bartosz Kostrzewa🇩🇪 · Vittorio Lubicz🇮🇹 · Lorenzo Maio🇮🇹 · Francesca Margari🇮🇹 and 7 other authors

    We present a strategy to compute the inclusive decay rate for the process from first principles in lattice QCD. The physical decay rate is obtained from the interpolation of non-perturbative lattice data, obtained at lighter than physical heavy meson masses (GeV), with the Operator Product Expansion predictions, which become exact in the limit of infinitely heavy quarks. We also present a new method for the computation of the required lattice four-point correlators, which represents a considerable improvement over the state-of-the-art on the subject. We show the effectiveness of the strategy by performing the calculation on a subset of the available physical-point Extended Twisted Mass Collaboration (ETMC) gauge ensembles. Our current determination of the inclusive decay rate has a 7% total error, that is dominated by uncertainties due to the relatively limited configuration ensembles considered herein, and can be significantly reduced in the near future.

    hep-lathep-ph2 citations
  5. 05

    Toward Hamiltonian simulations of Maxwell-Chern-Simons theory: constant modes and gauge field truncation

    Andrea Bulgarelli🇩🇪 · Maria Cristina Diamantini🇮🇹 · Nico Dichter🇩🇪 · Lena Funcke🇩🇪 · Tobias Hartung🇬🇧 · Karl Jansen🇨🇾 · Enrique Rico Ortega🇪🇸 · Simran Singh🇩🇪 · Lorenzo Spera🇮🇹

    Maxwell-Chern-Simons (MCS) theory in dimensions provides a paradigmatic example of a topological gauge theory with both dynamical and topological degrees of freedom. Its Euclidean formulation suffers from a sign problem, making Hamiltonian numerical approaches particularly attractive. As a first step toward the non-perturbative Hamiltonian study of MCS theory, we investigate the constant mode sector on a spatial torus. Being analytically solvable in the continuum, it provides an ideal benchmark for understanding how the topological properties of the theory are encoded in a finite-dimensional lattice Hilbert space. We construct a finite-dimensional discretization of the torus of flat connections and show that the resulting lattice problem maps onto a generalized Harper-Hofstadter model with twisted boundary conditions. We identify the commensurability conditions under which the finite lattice exactly reproduces the magnetic translation algebra and the topological degeneracy of the continuum theory. A systematic analysis of gauge field truncation and its convergence toward the continuum limit is then presented.

    ↳ hep-thcond-mat.str-elhep-latquant-ph0 citations
  6. 06

    Elastic deuteron-deuteron scattering within Nuclear Lattice Effective Field Theory

    Helen Meyer🇩🇪 · Serdar Elhatisari🇹🇷 · Fabian Hildenbrand🇩🇪 · Ulf-G. Meißner🇩🇪

    We calculate low-energy deuteron-deuteron scattering in the spin-quintet channel using nuclear lattice effective field theory. The calculation combines chiral interactions at next-to-next-to-next-to-leading order, implemented through wavefunction matching, with the adiabatic projection method. Because the radial cluster basis develops small norm-matrix eigenvalues at large Euclidean projection time, we investigate two stabilization procedures: Tikhonov regularization and projection onto well-resolved norm eigenmodes. The two procedures yield consistent Coulomb-subtracted phase shifts within their statistical and numerical uncertainties. A Coulomb-modified effective-range analysis gives and . The phase shifts are more negative, and the scattering length is substantially larger than in previous calculations, corresponding to a stronger effective repulsion in the channel. These results provide a first nuclear-lattice benchmark for deuteron-deuteron scattering and establish a basis for future coupled-channel calculations of the deuteron-induced reactions relevant to big-bang nucleosynthesis.

    ↳ nucl-thhep-lat0 citations

Affiliations

first authorsco-authorsvia INSPIRE