μ--e+ conversion in upcoming LFV experiments

We present an illustrative discussion of the physics potential of mu(-)-e(+) conversion. We point out that this process, although much less frequently studied than the related but much more popular processes of mu(-)-e(-) conversion and neutrinoless double beta decay, may in fact be a promising alternative to detect both lepton flavour and number violation. However, for this goal to be reached, a combined effort of experiments and theory, both in nuclear and particle physics, is necessary to advance. The aim of this paper is to be an appetiser to trigger such an initiative. (C) 2016 The Authors. Published by Elsevier B.V.