On the definition of schemes for computing leading order isospin breaking corrections

Preprint number: CP3-Origins-2018-38 DNRF90
Authors: Andrea Bussone (IFT), Michele Della Morte (CP3-Origins & DIAS), Janowski Tadeusz (Edinburgh University), and Andre Walker-Loud (Livermore Lab)

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We discuss the need for introducing a ‘line of constant physics’
(i.e., a scheme) when computing
isospin breaking corrections to hadronic quantities.
We show that within a certain class of schemes
one can separate the electromagnetic corrections from the
strong isospin breaking corrections at
leading order, meaning that within this class scheme-ambiguities are
higher order effects.