Miguel Teseo San José Pérez
(Johannes Gutenberg Universität)
The electromagnetic coupling that intervenes in the interactions between charged particles varies with the energy due to off-shell processes. In this work we compute the leading hadronic contribution to this running at low energies, where QCD is fully non-perturbative.
We employ a subset of CLS (Coordinated Lattice Simulations) ensembles with Nf = 2+1 and O(a) improved Wilson fermions in open boundary conditions in time and periodic in space. For each ensemble we extracted the vacuum polarization function, which is proportional to the running, using the time-momentum representation. The set of ensembles has different particle masses and four lattice spacings, in such a way that we have been able to perform the chiral and continuum extrapolation.
Miguel Teseo San José Pérez
(Johannes Gutenberg Universität)
Dr
Antoine Gérardin
(John von Neumann Institute for Computing, DESY)
Prof.
Hartmut Wittig
(Helmholtz-Institut Mainz & PRISMA+ Cluster of Excellence & Institut für Kernphysik, Johannes Gutenberg-Universität Mainz)
Prof.
Harvey B. Meyer
(Cluster of Excellence PRISMA and PRISMA+ & Institut für Kernphysik & Helmholtz-Institut Mainz, Johannes Gutenberg-Universität Mainz)
Jonas Wilhelm
(Universität Mainz)
Dr
Kohtaroh Miura
(Helmholtz-Institut Mainz, Johannes Gutenberg-Universität Mainz & Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University)
Dr
Konstantin Ottnad
(Institut für Kernphysik, Johannes Gutenberg-Universität Mainz)
Dr
Marco Cè
(Johannes Gutenberg-Universität Mainz)
