Loop-enhanced rate of neutrinoless double beta decay

Abstract

Neutrino masses can be generated radiatively. In such scenarios their masses are calculated by evaluating a self-energy diagram with vanishing external momentum, i.e. taking only the leading order term in a momentum expansion. The difference between the full self-energy and the mass is experimentally difficult to access, since one needs off-shell neurinos to observe them. However, massive Majorana neutrinos that mediate neutrinoless double beta decay ($0\nu \beta \beta$) are off-shell, with the virtuality of order 100 MeV. If the energy scale of the self-energy loop is of the order of this virtuality, the amplitude of double beta decay can be modified by the unsuppressed loop effect. This can have a drastic impact on the interpretation of future observations of the $0\nu \beta \beta$ decay.

15 pages, 4 figures

References in corpus (10)

• Improved Naturalness with a Heavy Higgs: An Alternative Road to LHC Physics
• Neutrinoless Double-Beta Decay: Status and Prospects
• From the trees to the forest: a review of radiative neutrino mass models
• Inert Doublet Model and LEP II Limits
• Natural Dark Matter from an Unnatural Higgs Boson and New Colored Particles at the TeV Scale
• The Inert Dark Matter
• Systematic classification of two-loop realizations of the Weinberg operator
• Revising Limits on Neutrino-Majoron Couplings
• Tensor and scalar interactions of neutrinos may lead to observable neutrino magnetic moments
• Minimal Radiative Neutrino Masses

Cited by in corpus (4)

• Neutrino Self-Interactions and Double Beta Decay
• Probing New Physics with Long-Range Neutrino Interactions: An Effective Field Theory Approach
• Decomposition of $d=9$ short-range $0\nu \beta \beta$ decay operators at one-loop level
• Neutrino masses and mixing from milli-charged dark matter