Conveners
Standard Model parameters
- V. Ravindran
Standard Model parameters
- Oliver Witzel (Universität Siegen)
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Viljami Leino03/11/2025, 16:40Talk
The strong coupling constant $\alpha_s$ can be obtained from the static energy. For short distances, the static energy can be calculated both on the lattice, with the use of Wilson line correlators, and with the perturbation theory up to three loop accuracy with leading ultrasoft log resummation. Comparing lattice data with the perturbative expression allows for a precise measurement of the...
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Yash Mandlecha (Graduate Research Assistant)03/11/2025, 17:00Talk
Precise determination of the strong coupling, $\alpha_s$, at the electroweak scale $m_Z$ is crucial for high-energy phenomenology and precision QCD tests. We apply the continuous $\beta$-function method to four-flavor lattice QCD with highly improved staggered quarks. This approach defines the coupling via gradient flow and allows direct determination of the $\beta$-function in the infinite...
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Isabella Leone Zimmel03/11/2025, 17:20Talk
The decoupling strategy allows to obtain the value of the strong coupling in QCD from the running in pure gauge. Here we present our strategy to determine the running in the SU(3) Yang-Mills theory. We use a finite volume scheme with twisted boundary conditions and a step-scaling approach based on a gradient flow coupling. We show preliminary results for the continuum extrapolation of the...
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Riccardo Marinelli (“Sapienza” University of Rome)05/11/2025, 09:00
We show preliminary results for the nonperturbative Renormalization Group (RG) running of the full $\Delta F=2$ four-fermion operators basis in QCD with $N_f=3$ massless dynamical flavours. The perturbative part of the running is obtained extending the conventional approaches in the literature, employing the Poincaré–Dulac theorem. The nonperturbative computations employ...
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Nicolas Lang (IFIC, U. Valencia and CSIC)05/11/2025, 09:20Talk
The approach to the continuum of a given discretization of a quantum field theory is understood within the framework of Symanzik Effective Field Theory. It explains the concept of universality whereby dimensionless renormalized observables approach the same continuum value in any discretization. The functional form of these observables as functions of the lattice spacing depends on the...
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Fernando Pérez Panadero (IFT-UAM/CSIC)05/11/2025, 09:40Talk
We report on the status of an update of our previous computation of light and strange quark masses in QCD with $N_f=2+1$ dynamical flavour. Bare quark masses are extracted from CLS ensembles, using $\mbox{O}(a)$-improved Wilson fermions, and the mass renormalization is performed non-perturbatively in the Schrödinger functional scheme over a wide range of scales to make safe contact with...
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Simon Kuberski05/11/2025, 10:00Talk
We present a determination of the charm- and bottom-quark masses using the step-scaling approach to heavy-quark physics. Renormalization is performed in small volumes where relativistic bottom quarks can be simulated directly. A sequence of finite-volume simulations connects this calculation to large-volume CLS ensembles, where simulations at physical light and strange quark masses provide...
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