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Title: An electroweak basis for neutrinoless double β decay

Journal Article · · Journal of High Energy Physics (Online)

Here, a discovery of neutrinoless double-β decay would be profound, providing the first direct experimental evidence of ΔL = 2 lepton number violating processes. While a natural explanation is provided by an effective Majorana neutrino mass, other new physics interpretations should be carefully evaluated. At low-energies such new physics could man-ifest itself in the form of color and SU(2)L × U(1)Y invariant higher dimension operators. Here we determine a complete set of electroweak invariant dimension-9 operators, and our analysis supersedes those that only impose U(1)em invariance. Imposing electroweak invariance implies: 1) a significantly reduced set of leading order operators compared to only imposing U(1)em invariance; and 2) other collider signatures. Prior to imposing electroweak invariance we find a minimal basis of 24 dimension-9 operators, which is reduced to 11 electroweak invariant operators at leading order in the expansion in the Higgs vacuum expectation value. We set up a systematic analysis of the hadronic realization of the 4-quark operators using chiral perturbation theory, and apply it to determine which of these operators have long-distance pion enhancements at leading order in the chiral expansion. We also find at dimension-11 and dimension-13 the electroweak invariant operators that after electroweak symmetry breaking produce the remaining ΔL = 2 operators that would appear at dimension-9 if only U(1)em is imposed.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
LDRD; USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1398909
Report Number(s):
LA-UR--16-23550
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2017; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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A neutrinoless double beta decay master formula from effective field theory text January 2018
Neutrinoless Double Beta Decay and the Baryon Asymmetry of the Universe text January 2017
Neutrinoless double beta decay in chiral effective field theory: lepton number violation at dimension seven text January 2017
Neutrinoless double- β decay matrix elements in light nuclei journal January 2018
New Leading Contribution to Neutrinoless Double- β Decay journal May 2018
Heavy Physics Contributions to Neutrinoless Double Beta Decay from QCD journal October 2018
A neutrinoless double beta decay master formula from effective field theory journal December 2018
Cosmological implications of lepton number violation journal November 2018
Neutrinoless double beta decay in chiral effective field theory: lepton number violation at dimension seven journal December 2017
Renormalized approach to neutrinoless double- β decay journal November 2019
A new leading contribution to neutrinoless double-beta decay text January 2018
Neutrinoless double beta decay and the baryon asymmetry of the Universe journal September 2018