The Double β Neutrino-less (2β0ν) is a fundamental process expected if neutrinos were Majorana particles; i.e. a neutrino being its own anti-particle. There is wide theoretically motivation behind this hypothesis including vast phenomenology. However, 2β0ν remains experimentally unproved. Therefore, the 2β0ν search is a compelling subject of fundamental neutrino research to establish the most profound nature of neutrinos with major potential consequences to our understanding of the Universe as of today.

In this 1-day dedicated workshop, we aim to review mainly the experimental panorama - present and future - including R&D efforts within France's IN2P3/CNRS framework. Beyond reviewing both the experimental and theoretical status of the field, we shall have dedicated descriptions of ongoing experimental efforts SuperNEMO and CUPID and R&D efforts such as DARWIN-ββ, LiquidO et R2D2. We shall finalise with some discussion about possible common points and prospects.