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Journal Article

Inverse neutrinoless double beta decay revisited: Neutrinos, Higgs triplets, and a muon collider


Rodejohann,  Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Rodejohann, W. (2010). Inverse neutrinoless double beta decay revisited: Neutrinos, Higgs triplets, and a muon collider. Physical Review D, 81(11): 114001, pp. 1-10. doi:10.1103/PhysRevD.81.114001.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7136-A
We revisit the process of inverse neutrino-less double beta decay (e e -> W W) at future linear colliders. The cases of Majorana neutrino and Higgs triplet exchange are considered. We also discuss the processes e mu -> W W and mu mu -> W W, which are motivated by the possibility of muon colliders. For heavy neutrino exchange and center of-mass energies larger than 1 TeV, we show that masses up to 106 (105) GeV could be probed for e-e and e-mu machines, respectively. The stringent limits for mixing of heavy neutrinos with muons render mu mu -> W W less promising, even though this process is not constrained by limits from neutrino-less double beta decay. If Higgs triplets are responsible for inverse neutrino-less double beta decay, observable signals are only possible if a very narrow resonance is met. We also consider unitarity aspects of the process in case both Higgs triplets and neutrinos are exchanged. An exact see-saw relation connecting low energy data with heavy neutrino and triplet parameters is found.