Speaker
Prof.
Roberto Frezzotti
(University of Rome Tor Vergata, Physics Department and INFN - Sezione di Roma Tor Vergata)
Description
We show that maximally twisted mass fermions can be employed to regularize on the lattice
the fully unquenched QCD+QED theory with vanishing theta-term. We discuss how the critical
mass of the up and down quarks can be conveniently determined beyond the electroquenched
approximation by imposing that certain symmetries of continuum QCD+QED, which are broken by
Wilson terms, are restored (up to cutoff effects). A mixed action setup is sketched that allows to extend the computation of the leading isospin breaking corrections to physical observables via the RM123 method beyond the electroquenched approximation by using ETMC (pure QCD) gauge configurations with N_f=2+1+1 dynamical quark flavours, with only O(a^2) lattice artifacts.
Primary author
Prof.
Roberto Frezzotti
(University of Rome Tor Vergata, Physics Department and INFN - Sezione di Roma Tor Vergata)
Co-authors
Prof.
Giancarlo Rossi
(University of Rome Tor Vergata, Physics Department and INFN, Sezione di Roma Tor Vergata and Centro Fermi, Roma)
Dr
Nazario Tantalo
(University of Rome Tor Vergata, Physics Department and INFN, Sezione di Roma Tor Vergata)
