# Rotated twisted-mass: a convenient regularization scheme for isospin breaking QCD and QED lattice calculations

@inproceedings{Frezzotti2021RotatedTA,
title={Rotated twisted-mass: a convenient regularization scheme for isospin breaking QCD and QED lattice calculations},
author={R. Frezzotti and Giuseppe Gagliardi and V. Lubicz and Francesco Sanfilippo and S. Simula},
year={2021}
}
We propose a scheme of lattice twisted-mass fermion regularization which is particularly convenient for application to isospin breaking (IB) QCD and QED calculations, based in particular on the so called RM123 approach, in which the IB terms of the action are treated as a perturbation. The main, practical advantage of this scheme is that it allows the calculation of IB effects on some mesonic observables, like e.g. the π − π mass splitting, using lattice correlation functions in which the quark… Expand
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First direct lattice calculation of the chiral perturbation theory low-energy constant $\ell_7$
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R. Frezzotti,1, ∗ G. Gagliardi,2, † V. Lubicz,3, ‡ G. Martinelli,4, § F. Sanfilippo,2, ¶ and S. Simula2, ∗∗ Dipartimento di Fisica and INFN, Università di Roma “Tor Vergata”, Via della RicercaExpand

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