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Hadronic physics from a Wilson fermion mixed-action approach: setup and scale setting.

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Title: Hadronic physics from a Wilson fermion mixed-action approach: setup and scale setting.
Authors: Bussone, Andrea1 (AUTHOR), Conigli, Alessandro2,3 (AUTHOR), Frison, Julien4 (AUTHOR), Herdoíza, Gregorio5,6 (AUTHOR), Pena, Carlos5,6 (AUTHOR), Preti, David7 (AUTHOR), Romero, José Ángel5 (AUTHOR), Sáez, Alejandro5,6,8 (AUTHOR) asaez@ific.uv.es, Ugarrio, Javier5,6 (AUTHOR)
Source: European Physical Journal C -- Particles & Fields. May2026, Vol. 86 Issue 5, p1-68. 68p.
Subjects: Lattice quantum chromodynamics, Fermions, Gauge field theory, Pions, Calibration
Abstract: We introduce a lattice QCD mixed action approach that employs Wilson-type quarks in the sea and valence sectors. The sea sector is based on gauge ensembles with N f = 2 + 1 flavours of non-perturbatively O(a)-improved Wilson fermions generated by the Coordinated Lattice Simulations (CLS) initiative. The parameter space of the considered ensembles encompasses five values of the lattice spacing, a range of pion masses extending down to the physical point, and large physical volumes. In the valence sector, we employ Wilson twisted-mass fermions at maximal twist, using the same massless Wilson-Dirac operator in both the sea and valence sectors. We describe the strategy applied for the required matching of the sea and valence quark masses along the target renormalised chiral trajectory. A precise universality test is then conducted by comparing the continuum-limit results of the mixed-action approach and of the unitary setup, in which the same Wilson fermion regularisation is employed in the sea and in the valence. As a key application, we conduct a scale setting procedure based on lattice determinations of the masses and decay constants of the pion and kaon, as well as the gradient flow scale t 0 . The scale setting can consequently be performed in three distinct ways, utilising the unitary setup, the mixed action approach, and their combination. We observe that the latter combination results in enhanced control of the systematic uncertainties, thereby yielding a precise determination of the physical value of t 0 . [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Hadronic physics from a Wilson fermion mixed-action approach: setup and scale setting.
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  Data: <searchLink fieldCode="AR" term="%22Bussone%2C+Andrea%22">Bussone, Andrea</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Conigli%2C+Alessandro%22">Conigli, Alessandro</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Frison%2C+Julien%22">Frison, Julien</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Herdoíza%2C+Gregorio%22">Herdoíza, Gregorio</searchLink><relatesTo>5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pena%2C+Carlos%22">Pena, Carlos</searchLink><relatesTo>5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Preti%2C+David%22">Preti, David</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Romero%2C+José+Ángel%22">Romero, José Ángel</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sáez%2C+Alejandro%22">Sáez, Alejandro</searchLink><relatesTo>5,6,8</relatesTo> (AUTHOR)<i> asaez@ific.uv.es</i><br /><searchLink fieldCode="AR" term="%22Ugarrio%2C+Javier%22">Ugarrio, Javier</searchLink><relatesTo>5,6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+C+--+Particles+%26+Fields%22">European Physical Journal C -- Particles & Fields</searchLink>. May2026, Vol. 86 Issue 5, p1-68. 68p.
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– Name: Abstract
  Label: Abstract
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  Data: We introduce a lattice QCD mixed action approach that employs Wilson-type quarks in the sea and valence sectors. The sea sector is based on gauge ensembles with N f = 2 + 1 flavours of non-perturbatively O(a)-improved Wilson fermions generated by the Coordinated Lattice Simulations (CLS) initiative. The parameter space of the considered ensembles encompasses five values of the lattice spacing, a range of pion masses extending down to the physical point, and large physical volumes. In the valence sector, we employ Wilson twisted-mass fermions at maximal twist, using the same massless Wilson-Dirac operator in both the sea and valence sectors. We describe the strategy applied for the required matching of the sea and valence quark masses along the target renormalised chiral trajectory. A precise universality test is then conducted by comparing the continuum-limit results of the mixed-action approach and of the unitary setup, in which the same Wilson fermion regularisation is employed in the sea and in the valence. As a key application, we conduct a scale setting procedure based on lattice determinations of the masses and decay constants of the pion and kaon, as well as the gradient flow scale t 0 . The scale setting can consequently be performed in three distinct ways, utilising the unitary setup, the mixed action approach, and their combination. We observe that the latter combination results in enhanced control of the systematic uncertainties, thereby yielding a precise determination of the physical value of t 0 . [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1140/epjc/s10052-026-15518-1
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      – Code: eng
        Text: English
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        PageCount: 68
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      – SubjectFull: Lattice quantum chromodynamics
        Type: general
      – SubjectFull: Fermions
        Type: general
      – SubjectFull: Gauge field theory
        Type: general
      – SubjectFull: Pions
        Type: general
      – SubjectFull: Calibration
        Type: general
    Titles:
      – TitleFull: Hadronic physics from a Wilson fermion mixed-action approach: setup and scale setting.
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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