PaperPanorama

HEP Lattice·hep-lat

Fri·Jul 24, 2026

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    Spin and momentum fraction carried by partons in the nucleon

    Constantia Alexandrou🇨🇾 · Simone Bacchio🇨🇾 · Jacob Finkenrath🇩🇪 · Christos Iona🇨🇾 · Giannis Koutsou🇨🇾 · Christian Kummer🇨🇾 · Yan Li🇨🇾 · Bhavna Prasad🇨🇾 · Gregoris Spanoudes🇨🇾

    We determine the momentum fraction and angular momentum carried by quarks and gluons in the proton in lattice QCD. We use four ensembles simulated with up, down, strange and charm quarks with their masses tuned to their physical values. These ensembles have similar physical volume and different lattice spacings allowing us to take the continuum limit directly at the physical pion mass point. We extract the quark and gluon momentum fractions and total angular momentum in the continuum limit as well as the intrinsic quark spin and orbital angular momentum contributions to the proton spin. We find the total momentum fraction and the total spin , showing that both the momentum and spin sum rules are satisfied. We compare our results to those extracted from phenomenological analyses.

    hep-lathep-exhep-phnucl-ex+10 citations
  2. 02

    Perturbative quantum electrodynamics with generalized domain wall fermions

    Matteo Di Carlo🇨🇭 · Antonin Portelli🇬🇧

    In this paper we derive the expansion of the generalized domain-wall fermion Dirac operator including electromagnetic corrections up to , which are relevant for lattice computations of radiative corrections to hadronic processes with chiral fermions. In the generalized formulation of the domain-wall fermionic QCD+QED action, physical quark fields are related to the corresponding five-dimensional fields in a way which depends on the (QCD+QED) gauge links, generating extra contact terms when expanding correlation functions with respect to the electric charge. We re-derive the known first-order correction using a background-field approach and, at second order, obtain new local operator insertions (seagull vertices) required for gauge covariant calculations.

    hep-lat0 citations
  3. 03

    Stochastic Quantization as Optimal Control

    Lingxiao Wang🇯🇵

    Stochastic quantization defines a Euclidean quantum field theory as the equilibrium of a fictitious-time Langevin dynamics, which reaches the Gibbs measure asymptotically. We show that this quantization can be formulated as a finite-time stochastic optimal control problem. A tractable reference process, naturally supplied by the free theory when available, provides an Ornstein--Uhlenbeck dynamics, while the full interaction enters as a reference-corrected terminal cost. The optimal control is a Doob-transform force that steers the path-reweighted terminal ensemble to the target at a prescribed time and for a given noise amplitude. A neural network learns the residual control, realizing this optimal stochastic quantization (OSQ). Because the path weights are exact, imperfect training increases the variance of estimators but does not introduce model bias. On multimodal potentials we recover all modes at finite time and find that the noise amplitude sets a practical diffusion-horizon window. In two-dimensional lattice scalar theory we recover observables from hybrid Monte Carlo simulations near the critical point. Quantization is thereby formulated as control rather than equilibration.

    hep-lathep-th0 citations
  4. 04

    Parallel Tempered Metadynamics for full QCD

    Timo Eichhorn🇩🇪 · Gianluca Fuwa🇩🇪 · Christian Hoelbling🇩🇪 · Lukas Varnhorst🇩🇪

    We present an algorithm that addresses topological freezing in lattice QCD simulations by combining parallel tempering with collective-variable-based enhanced sampling methods, and apply it to a particularly challenging system with staggered fermions. We find that the algorithm unfreezes the system, which is otherwise completely frozen for approximately 40000 Molecular Dynamics Units with the Rational Hybrid Monte Carlo algorithm.

    hep-lat1 citation
  5. 05

    Hyperasymptotic Expansions in QCD: The Lightest Gluelump Mass Case

    Antonio Pineda🇪🇸

    In these proceedings, we provide a summary of our recent advancements in determining the mass of the lightest gluelump using hyperasymptotic expansions in Quantum Chromodynamics (QCD) \cite{Ayala2025}. This paper details our methodology, our precise determination of leading renormalon normalization constants, and our extraction of the gluelump mass from two independent physical systems, yielding a final combined, renormalization-group-invariant and scheme-independent result of .

    ↳ hep-phhep-lathep-th0 citations
  6. 06

    Transverse-momentum resummation effects on angular coefficients in Z and W boson hadroproduction

    Stefano Camarda🇨🇭 · Giancarlo Ferrera🇮🇹 · Lorenzo Rossi🇮🇹 · Gabriele Francesco Sala🇮🇹

    We present a comprehensive analysis of the angular coefficients of and boson production at hadron colliders in different kinematical ranges, using data from the ATLAS, LHCb, and CMS Collaborations at the LHC, as well as CDF data at the Tevatron. We provide theoretical predictions obtained by consistently combining the resummation of logarithmically enhanced QCD corrections at small transverse momenta up to next-to-next-to-leading logarithmic accuracy (NNLL) with fixed-order calculations at next-to-leading order (NLO), valid at large . We quantify the impact of transverse-momentum resummation on the angular coefficients. We find that the inclusion of resummation effects leads to a moderate and systematic improvement in the description of the data in the intermediate region, ~GeV, for several angular coefficients, while in the remaining cases it does not degrade the agreement of fixed-order QCD predictions with experimental measurements.

    ↳ hep-phhep-exhep-lat0 citations
  7. 07

    Neural solutions of coupled ghost and gluon Dyson--Schwinger equations in Landau gauge

    Rodrigo Carmo Terin🇪🇸

    The coupled ghost and gluon Dyson--Schwinger equations (DSEs) of four-dimensional Landau-gauge Yang--Mills (YM) theory are solved with a neural representation trained only from renormalized equation residuals. The neural and fixed-point solutions agree at the percent level and remain stable under changes of initialization, network size, integration grid, and infrared boundary condition. Variations of the three-gluon vertex model produce substantially larger effects than the neural error. The MiniMOM ultraviolet running and the sign change of the gluon Schwinger function are also reproduced within the limitations of the truncation.

    ↳ hep-phcs.LGhep-lathep-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE