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  • Open Access

Nonsinglet vector current in lattice QCD: O(a)-improvement from large volumes

Tim Harris

Harvey B. Meyer

  • Institute for Theoretical Physics, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zürich, Switzerland

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Phys. Rev. D 113, 114510 – Published 11 June, 2026

DOI: https://doi.org/10.1103/hpqh-tstb

Abstract

In previous work, we determined the improvement coefficients cV and cV˜ required for the massless O(a)-improvement of the local and point-split discretizations of the nonsinglet vector current for Nf=3 nonperturbatively O(a)-improved Wilson fermions and the Lüscher-Weisz gauge action, using ensembles of large-volume configurations generated by the coordinated lattice simulations (CLS) initiative. A new estimate for the mass-dependent improvement coefficient b¯Aeff has recently become available, differing from the one used in our earlier study, and on which our implementation via a massive axial Ward identity relied. Here, we update our analysis of the mass-independent vector improvement coefficients based on the new axial current improvement coefficient, and analyze additional ensembles with a different chiral trajectory in order to validate our results at two values of the bare coupling. We find that using the new estimate of b¯Aeff improves the consistency between the two chiral trajectories, as well as with a previous determination of the improvement coefficients directly in the massless limit on small volumes.

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Phys. Rev. D 113, 114510– Published 11 June, 2026
  • Received 26 November 2025
  • Accepted 27 March 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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