24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

Sea quark QED effects and twisted mass fermions

26 Jul 2016, 17:30
20m
Building 67 Room 1003 (Highfield Campus, University of Southampton)

Building 67 Room 1003

Highfield Campus, University of Southampton

Talk Theoretical Developments Theoretical Developments

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)

Presentation Materials