Inverse neutrinoless double beta decay (and other Delta L=2 processes)

Abstract

I review the prospects for the detection of Delta L=2 processes at future colliders. Except in contrived models, the process e- e- -> W- W- is unobservable at future linear colliders unless $\sqrt{s} \gsim 2$ TeV, due to constraints from neutrinoless double beta decay. As there are no analogous constraints on the Majorana mass of the ${\nu }_{\mu }$, mu- mu- -> W- W- could be observed at a muon collider with considerably lower $\sqrt{s}$. One can also consider esoteric processes such as gamma gamma -> mu+ mu+ W- W-. Such processes may be observable if $\sqrt{s} \gsim 4$ TeV.

7 pages, 3 figures; talk given at Beyond the Desert -- Accelerator, Non-Accelerator and Space Approaches into the Next Millenium}, Castle Ringberg, Tegernsee, Germany, June 1999