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

TL;DR

The paper proposes an alternative scheme for calculating leading order isospin breaking corrections in hadronic physics, allowing separation of electromagnetic and strong isospin effects with scheme ambiguities being higher order.

Contribution

It introduces a new scheme for computing isospin breaking corrections that clarifies the separation of electromagnetic and strong effects at leading order.

Findings

Scheme allows separation of electromagnetic and strong isospin breaking effects.

Scheme-ambiguities are higher order effects within the proposed class.

Provides a framework for consistent calculations of isospin corrections.

Abstract

We discuss an alternate scheme, or a 'line of constant physics', which can be used 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.