Unraveling the Dirac neutrino with cosmological and terrestrial detectors

We point out a correlation between the effective number of relativistic degrees of species Neff, the cosmologically measured mν,sterileeff, and the terrestrially measured neutrino mass sum and effective electron neutrino mass, Σmν and mνe, which arises in the Dirac neutrino hypothesis. If the neutri...

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Autores principales:	Peter Adshead, Yanou Cui, Andrew J. Long, Michael Shamma
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Dirac neutrino Sterile neutrino Beyond the Standard Model Neutrino mass Effective number of neutrinos Physics QC1-999
Acceso en línea:	https://doaj.org/article/c0b2ec53551e498d96200ca93e6699a4
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spelling	oai:doaj.org-article:c0b2ec53551e498d96200ca93e6699a42021-12-04T04:32:32ZUnraveling the Dirac neutrino with cosmological and terrestrial detectors0370-269310.1016/j.physletb.2021.136736https://doaj.org/article/c0b2ec53551e498d96200ca93e6699a42021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0370269321006766https://doaj.org/toc/0370-2693We point out a correlation between the effective number of relativistic degrees of species Neff, the cosmologically measured mν,sterileeff, and the terrestrially measured neutrino mass sum and effective electron neutrino mass, Σmν and mνe, which arises in the Dirac neutrino hypothesis. If the neutrinos are Dirac particles, and if the active neutrinos' sterile partners were once thermalized in the early universe, then this new cosmological relic would simultaneously contribute to the effective number of relativistic species, Neff, and also lead to a correlation between the cosmologically-measured effective sterile neutrino mass mν,sterileeff and the terrestrially-measured active neutrino mass sum Σmν. We emphasize that specifically correlated deviations in Neff≳3, mν,sterileeff and Σmν above their standard predictions could be the harbinger revealing the Dirac nature of neutrinos. We provide several benchmark examples, including Dirac leptogenesis, that predict a thermal relic population of the sterile partners, and we discuss the relevant observational prospects with current and near-future experiments. If the correlation highlighted in this work is observed in future surveys, it could be interpreted as supporting evidence of Dirac neutrino masses.Peter AdsheadYanou CuiAndrew J. LongMichael ShammaElsevierarticleDirac neutrinoSterile neutrinoBeyond the Standard ModelNeutrino massEffective number of neutrinosPhysicsQC1-999ENPhysics Letters B, Vol 823, Iss , Pp 136736- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Dirac neutrino Sterile neutrino Beyond the Standard Model Neutrino mass Effective number of neutrinos Physics QC1-999
spellingShingle	Dirac neutrino Sterile neutrino Beyond the Standard Model Neutrino mass Effective number of neutrinos Physics QC1-999 Peter Adshead Yanou Cui Andrew J. Long Michael Shamma Unraveling the Dirac neutrino with cosmological and terrestrial detectors
description	We point out a correlation between the effective number of relativistic degrees of species Neff, the cosmologically measured mν,sterileeff, and the terrestrially measured neutrino mass sum and effective electron neutrino mass, Σmν and mνe, which arises in the Dirac neutrino hypothesis. If the neutrinos are Dirac particles, and if the active neutrinos' sterile partners were once thermalized in the early universe, then this new cosmological relic would simultaneously contribute to the effective number of relativistic species, Neff, and also lead to a correlation between the cosmologically-measured effective sterile neutrino mass mν,sterileeff and the terrestrially-measured active neutrino mass sum Σmν. We emphasize that specifically correlated deviations in Neff≳3, mν,sterileeff and Σmν above their standard predictions could be the harbinger revealing the Dirac nature of neutrinos. We provide several benchmark examples, including Dirac leptogenesis, that predict a thermal relic population of the sterile partners, and we discuss the relevant observational prospects with current and near-future experiments. If the correlation highlighted in this work is observed in future surveys, it could be interpreted as supporting evidence of Dirac neutrino masses.
format	article
author	Peter Adshead Yanou Cui Andrew J. Long Michael Shamma
author_facet	Peter Adshead Yanou Cui Andrew J. Long Michael Shamma
author_sort	Peter Adshead
title	Unraveling the Dirac neutrino with cosmological and terrestrial detectors
title_short	Unraveling the Dirac neutrino with cosmological and terrestrial detectors
title_full	Unraveling the Dirac neutrino with cosmological and terrestrial detectors
title_fullStr	Unraveling the Dirac neutrino with cosmological and terrestrial detectors
title_full_unstemmed	Unraveling the Dirac neutrino with cosmological and terrestrial detectors
title_sort	unraveling the dirac neutrino with cosmological and terrestrial detectors
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/c0b2ec53551e498d96200ca93e6699a4
work_keys_str_mv	AT peteradshead unravelingthediracneutrinowithcosmologicalandterrestrialdetectors AT yanoucui unravelingthediracneutrinowithcosmologicalandterrestrialdetectors AT andrewjlong unravelingthediracneutrinowithcosmologicalandterrestrialdetectors AT michaelshamma unravelingthediracneutrinowithcosmologicalandterrestrialdetectors
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Unraveling the Dirac neutrino with cosmological and terrestrial detectors

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