New Leading Contribution to Neutrinoless Double-β Decay

Cirigliano, Vincenzo; Dekens, Wouter; De Vries, Jordy; Graesser, Michael L.; Mereghetti, Emanuele; Pastore, Saori; Van Kolck, Ubirajara

doi:10.1103/PhysRevLett.120.202001

New Leading Contribution to Neutrinoless Double-β Decay

Vincenzo Cirigliano
(
- Los Alamos
)
,
Wouter Dekens
(
- Los Alamos
)
,
Jordy De Vries
(
- NIKHEF, Amsterdam
)
,
Michael L. Graesser
(
- Los Alamos
)
,
Emanuele Mereghetti
(
- Los Alamos
)

Feb 27, 2018

6 pages

Published in:

Phys.Rev.Lett. 120 (2018) 20, 202001

Published: May 17, 2018

e-Print:

1802.10097 [hep-ph]

DOI:

10.1103/PhysRevLett.120.202001

Report number:

LA-UR-18-21404,
NIKHEF-2018-010

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Abstract: (APS)

Within the framework of chiral effective field theory, we discuss the leading contributions to the neutrinoless double-beta decay transition operator induced by light Majorana neutrinos. Based on renormalization arguments in both dimensional regularization with minimal subtraction and a coordinate-space cutoff scheme, we show the need to introduce a leading-order short-range operator, missing in all current calculations. We discuss strategies to determine the finite part of the short-range coupling by matching to lattice QCD or by relating it via chiral symmetry to isospin-breaking observables in the two-nucleon sector. Finally, we speculate on the impact of this new contribution on nuclear matrix elements of relevance to experiment.

Note:

6 pages, 3 figures

new physics
neutrino: Majorana: mass
lepton number: violation
double-beta decay: (0neutrino)
effective field theory: chiral
symmetry: chiral
model: renormalizable
operator: transition
operator: induced
operator: renormalization

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