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Nuclear Matrix Elements for Neutrinoless Double Beta Decay from Lattice QCD
Name
LATTICE2018_262.pdf
Description
Published version
Size
328.73 KB
Format
Adobe PDF
Checksum (MD5)
1d8be74be97c2bda04b7987a68f1dd61
Author(s)
Murphy, David
Detmold, William
Journal
Proceedings of Science
Publisher
Sissa Medialab
Version
Final published version
Abstract
© Copyright owned by the author(s) under the terms of the Creative Commons. While neutrino oscillation experiments have demonstrated that neutrinos have small, nonzero masses, much remains unknown about their properties and decay modes. One potential decay mode — neutrinoless double beta decay (0νββ) — is a particularly interesting target of experimental searches, since its observation would imply that the neutrino is a Majorana particle, demonstrate that lepton number conservation is violated in nature, and give further constraints on the neutrino masses and mixing angles. Relating experimental constraints on 0νββ decay rates to the neutrino masses, however, requires theoretical input in the form of non-perturbative nuclear matrix elements which remain difficult to calculate reliably. In this talk we will discuss progress towards first-principles calculations of relevant nuclear matrix elements using lattice QCD and effective field theory techniques, assuming neutrinoless double beta decay mediated by a light Majorana neutrino. We will show preliminary results for the π− → π+e−e− transition amplitude computed on a 163 ×32 domain wall fermion lattice with a pion mass of 420 MeV, and discuss improved methods applicable to general lattice calculations of 0νββ decay amplitudes.
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
10.22323/1.334.0262
