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Isospin Breaking Effects on the Lattice · Around

2013

Isospin Breaking Effects on the Lattice

Tantalo, Nazario

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Isospin symmetry is not exact and the corrections to the isosymmetric limit are, in general, at the percent level.

For gold plated quantities, such as pseudoscalar meson masses or the kaon leptonic and semileptonic decay rates, these effects are of the same order of magnitude of the errors quoted in nowadays lattice calculations and cannot be neglected any longer.
In this talk I discuss the methods that have been developed in the last few years to calculate isospin breaking corrections by starting from first principles lattice simulations.
In particular, I discuss how to perform a combined QCD+QED lattice simulation and a renormalization prescription to be used in order to separate QCD from QED isospin breaking effects.

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