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Title: The contribution of light Majorana neutrinos to neutrinoless double beta decay and cosmology

Abstract

Cosmology is making impressive progress and it is producing stringent bounds on the sum of the neutrino masses Σ, a parameter of great importance for the current laboratory experiments. In this letter, we exploit the potential relevance of the analysis of Palanque-Delabrouille et al. to the neutrinoless double beta decay (0νββ) search. This analysis indicates small values for the lightest neutrino mass, since the authors find Σ<84 meV at 1σ C.L., and provides a 1σ preference for the normal hierarchy. The allowed values for the Majorana effective mass, probed by 0νββ, turn out to be <75 meV at 3σ C.L. and lower down to less than 20 meV at 1σ C.L. . If this indication is confirmed, the impact on the 0νββ experiments will be tremendous since the possibility of detecting a signal will be out of the reach of the next generation of experiments.

Authors:
;  [1];  [2];  [3];  [4];  [3]
  1. INFN, Gran Sasso Science Institute,Viale F. Crispi 7, 67100 L’Aquila (Italy)
  2. INAF, Osservatorio Astronomico di Trieste,Via G.B. Tiepolo 11, 34131 Trieste (Italy)
  3. (Italy)
  4. INFN, Laboratori Nazionali del Gran Sasso,Via G. Acitelli 22, 67100 Assergi (AQ) (Italy)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22458413
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 12; Other Information: PUBLISHER-ID: JCAP12(2015)023; OAI: oai:repo.scoap3.org:13015; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; DOUBLE BETA DECAY; EFFECTIVE MASS; MAJORANA THEORY; MEV RANGE; NEUTRINOS; PROBES; SIGNALS

Citation Formats

Dell’Oro, S., Marcocci, S., Viel, M., INFN, Sezione di Trieste,Via Valerio 2, 34127 Trieste, Vissani, F., and INFN, Gran Sasso Science Institute,Viale F. Crispi 7, 67100 L’Aquila. The contribution of light Majorana neutrinos to neutrinoless double beta decay and cosmology. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/12/023.
Dell’Oro, S., Marcocci, S., Viel, M., INFN, Sezione di Trieste,Via Valerio 2, 34127 Trieste, Vissani, F., & INFN, Gran Sasso Science Institute,Viale F. Crispi 7, 67100 L’Aquila. The contribution of light Majorana neutrinos to neutrinoless double beta decay and cosmology. United States. doi:10.1088/1475-7516/2015/12/023.
Dell’Oro, S., Marcocci, S., Viel, M., INFN, Sezione di Trieste,Via Valerio 2, 34127 Trieste, Vissani, F., and INFN, Gran Sasso Science Institute,Viale F. Crispi 7, 67100 L’Aquila. Fri . "The contribution of light Majorana neutrinos to neutrinoless double beta decay and cosmology". United States. doi:10.1088/1475-7516/2015/12/023.
@article{osti_22458413,
title = {The contribution of light Majorana neutrinos to neutrinoless double beta decay and cosmology},
author = {Dell’Oro, S. and Marcocci, S. and Viel, M. and INFN, Sezione di Trieste,Via Valerio 2, 34127 Trieste and Vissani, F. and INFN, Gran Sasso Science Institute,Viale F. Crispi 7, 67100 L’Aquila},
abstractNote = {Cosmology is making impressive progress and it is producing stringent bounds on the sum of the neutrino masses Σ, a parameter of great importance for the current laboratory experiments. In this letter, we exploit the potential relevance of the analysis of Palanque-Delabrouille et al. to the neutrinoless double beta decay (0νββ) search. This analysis indicates small values for the lightest neutrino mass, since the authors find Σ<84 meV at 1σ C.L., and provides a 1σ preference for the normal hierarchy. The allowed values for the Majorana effective mass, probed by 0νββ, turn out to be <75 meV at 3σ C.L. and lower down to less than 20 meV at 1σ C.L. . If this indication is confirmed, the impact on the 0νββ experiments will be tremendous since the possibility of detecting a signal will be out of the reach of the next generation of experiments.},
doi = {10.1088/1475-7516/2015/12/023},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 12,
volume = 2015,
place = {United States},
year = {Fri Dec 11 00:00:00 EST 2015},
month = {Fri Dec 11 00:00:00 EST 2015}
}
  • Cosmology is making impressive progress and it is producing stringent bounds on the sum of the neutrino masses Σ, a parameter of great importance for the current laboratory experiments. In this letter, we exploit the potential relevance of the analysis of Palanque-Delabrouille et al. [JCAP 02 (2015) 045] to the neutrinoless double beta decay (0ν β β) search. This analysis indicates small values for the lightest neutrino mass, since the authors find Σ < 84 meV at 1σ C.L., and provides a 1σ preference for the normal hierarchy. The allowed values for the Majorana effective mass, probed by 0ν β β, turn out to be < 75more » meV at 3σ C.L. and lower down to less than 02 meV at 1σ C.L. . If this indication is confirmed, the impact on the 0ν β β experiments will be tremendous since the possibility of detecting a signal will be out of the reach of the next generation of experiments.« less
  • It is argued that neutrinoless double-{beta} decay (({beta}{beta}){sub 0{nu}}) does not depend on the physical Dirac or Majorana mass of the electron neutrino. A new scenario is proposed where the physical neutrino can naturally be a light Majorana particle, without any ({beta}{beta}){sub 0{nu}}. Supersymmetric grand unified theories are constructed incorporating this scenario.
  • We analyze the constraints on neutrino mass spectra with extra sterile neutrinos as implied by the LSND experiment. The various mass related observables in neutrinoless double beta decay, tritium beta decay and cosmology are discussed. Both neutrino oscillation results as well as recent cosmological neutrino mass bounds are taken into account. We find that some of the allowed mass patterns are severely restricted by the current constraints, in particular, by the cosmological constraints on the total sum of neutrino masses and by the nonmaximality of the solar neutrino mixing angle. Furthermore, we estimate the form of the four neutrino massmore » matrices and also comment on the situation in scenarios with two additional sterile neutrinos.« less
  • The possibility of various massive Majorana neutrinos canceling each other in neutrinoless double-..beta.. decay is examined. It is shown that if all neutrino eigenmasses are less than 10 MeV such a cancellation persists in the hadronic medium if initially present at the elementary (gauge) level. The same is true for neutrino mass greater than 10 GeV. In all other cases, such a cancellation will require a conspiracy between particle and nuclear physics.
  • If future neutrino oscillation experiments show that the neutrino mass spectrum is with normal ordering, m{sub 1}<m{sub 2}<m{sub 3}, and the searches for neutrinoless double beta [({beta}{beta}){sub 0{nu}}] decay with sensitivity to values of the effective Majorana mass |<m>| > or approx. 10{sup -2} eV give negative results, the next frontier in the quest for ({beta}{beta}){sub 0{nu}}-decay will correspond to |<m>|{approx}10{sup -3} eV. By assuming that massive neutrinos are Majorana particles and their exchange is the dominant mechanism generating ({beta}{beta}){sub 0{nu}}-decay, we analyze the conditions under which |<m>|, in the case of three-neutrino mixing and a neutrino mass spectrum withmore » normal ordering, would satisfy |<m>|{>=}0.001 eV. We consider the specific cases of (i) a normal hierarchical neutrino mass spectrum, (ii) a relatively small value of the CHOOZ angle {theta}{sub 13}, as well as (iii) the general case of a spectrum with normal ordering, a partial hierarchy, and a value of {theta}{sub 13} close to the existing upper limit. We study the ranges of the lightest neutrino mass m{sub 1} and/or of sin{sup 2}{theta}{sub 13} for which |<m>|{>=}0.001 eV and discuss the phenomenological implications of such scenarios. We provide also an estimate of |<m>| when the three-neutrino masses and the neutrino mixing originate from a neutrino mass term of the Majorana type for the (left-handed) flavor neutrinos and {sub j}{sup 3}m{sub j}U{sub ej}{sup 2}=0, but there does not exist a symmetry which forbids the ({beta}{beta}){sub 0{nu}}-decay.« less