Conveners
Standard-Model parameters
- Curtis Peterson (Michigan State University)
Standard-Model parameters
- Andrea Shindler
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Justus Kuhlmann (ETH Zürich)27/07/2026, 14:003Standard-Model parametersContributed talk
We present an update on the determination of renormalization constants and improvement coefficients for exponential-clover improved Wilson fermions in the coupling regime of interest for the large volume simulations of the OpenLat initiative ($a\approx 0.034-0.12\,{\rm fm}$). Particular focus is put on the renormalization of the non-singlet vector current using a massless renormalization...
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Lukas Holan (Humboldt University of Berlin)27/07/2026, 14:203Standard-Model parametersContributed talk
Non-perturbative determinations of renormalization and improvement coefficients are an integral part of the continuum limit of lattice calculations. We explore an alternative strategy that uses composite operators at positive flow time as probes together with finite axial Ward identities to resolve the mixing due to the breaking of chiral symmetry generated by Wilson-like fermions. The...
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Fernando Pérez Panadero (IFT-UAM/CSIC)27/07/2026, 14:405Standard-Model parametersContributed talk
We report on the status of an ongoing determination of the light and strange quark masses in QCD with $N_{f}=2+1$ dynamical flavours. Using CLS gauge ensembles, we employ a combination of a unitary non-perturbatively $\mathrm{O}(a)$-improved Wilson setup and a mixed-action approach with Wilson twisted-mass quarks at maximal twist in the valence. Bare quark masses are extracted from the PCAC...
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Erik Bäske (Humboldt-Universität zu Berlin)27/07/2026, 15:003Standard-Model parametersContributed talk
Current discrepancies between inclusive and exclusive determinations of the CKM matrix-element $V_{us}$ necessitate the inclusion of isospin-breaking effects to reach sub-percent precision. Here we present some results of an exploratory study of the determination of the inclusive hadronic decay-rate of the tau lepton without neglecting isospin-breaking effects. To allow charged states to...
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David Mason (JSC)27/07/2026, 15:203Standard-Model parametersContributed talk
The electromagnetic coupling at the $Z$ pole, $\alpha_{\text{em}}(M_Z^2)$, is a key input for electroweak precision tests and searches for physics beyond the Standard Model. Fully exploiting the potential of future collider experiments will require a significant reduction of the theoretical uncertainties on this quantity. The dominant source of uncertainty stems from the hadronic running of...
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Anna Hasenfratz28/07/2026, 14:006Standard-Model parameters
We present a practical gradient-flow (GF) renormalization scheme for composite fermion operators based on conserved-current correlation functions. The method determines the fermion wave-function renormalization nonperturbatively from simple two-point correlators, avoiding the need for calculating local flowed operators. The resulting GF-renormalized operators are finite at nonzero flow time...
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Mingwei Dai (University of Illinois Urbana-Champaign)28/07/2026, 14:205Standard-Model parametersContributed talk
Renormalized quark masses are fundamental parameters of the Standard Model, serving as critical inputs for theoretical predictions across a wide range of physics processes. In this work, we study Highly Improved Staggered Quark (HISQ) ensembles in the gradient flow lattice scheme. Using a small subset of our physical point ensembles, we compute flow-time-dependent renormalized quark masses...
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Curtis Peterson (Michigan State University)28/07/2026, 14:404Standard-Model parametersContributed talk
The strong coupling $\alpha_{\mathrm{s}}(m_{Z})$ at the pole mass $m_{Z}$ of the $Z$ boson is a fundamental parameter of the Standard Model. I discuss ongoing efforts targeting a precise determination of the strong coupling from the continuous (infinite volume) gradient flow $\beta$-function using the highly improved staggered quark (HISQ) action.
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Max Hansen28/07/2026, 15:005Standard-Model parametersContributed talk
We report on recent progress in extracting multi-hadron $D$ decay amplitudes in a pilot study using three ensembles of stabilised Wilson fermions at the SU(3) flavour-symmetric point. Our focus is on the analogue of $D \to K\pi$, where the final state is in the flavour 27-plet. The calculation involves two key steps: determining the finite-volume spectrum for five total spatial momenta in a...
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