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New limits on neutrino non-unitary mixings based on prescribed singular values

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F20%3A50016701" target="_blank" >RIV/62690094:18470/20:50016701 - isvavai.cz</a>

  • Výsledek na webu

    <a href="https://link.springer.com/article/10.1007/JHEP03(2020)169" target="_blank" >https://link.springer.com/article/10.1007/JHEP03(2020)169</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1007/JHEP03(2020)169" target="_blank" >10.1007/JHEP03(2020)169</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    New limits on neutrino non-unitary mixings based on prescribed singular values

  • Popis výsledku v původním jazyce

    Singular values are used to construct physically admissible 3-dimensional mixing matrices characterized as contractions. Depending on the number of singular values strictly less than one, the space of the 3-dimensional mixing matrices can be split into four disjoint subsets, which accordingly corresponds to the minimal number of additional, non-standard neutrinos. We show in numerical analysis that taking into account present experimental precision and fits to different neutrino mass splitting schemes, it is not possible to distinguish, on the level of 3-dimensional mixing matrices, between two and three extra neutrino states. It means that in 3+2 and 3+3 neutrino mixing scenarios, using the so-called alpha parametrization, ranges of non-unitary mixings are the same. However, on the level of a complete unitary 3+1 neutrino mixing matrix, using the dilation procedure and the Cosine-Sine decomposition, we were able to shrink bounds for the &quot;light-heavy&quot; mixing matrix elements. For instance, in the so-called seesaw mass scheme, a new upper limit on |U-e4| is about two times stringent than before and equals 0.021. For all considered mass schemes the lowest bounds are also obtained for all mixings, i.e. |U-e4|, |U-mu 4|, |U-tau 4|. New results obtained in this work are based on analysis of neutrino mixing matrices obtained from the global fits at the 95% CL.

  • Název v anglickém jazyce

    New limits on neutrino non-unitary mixings based on prescribed singular values

  • Popis výsledku anglicky

    Singular values are used to construct physically admissible 3-dimensional mixing matrices characterized as contractions. Depending on the number of singular values strictly less than one, the space of the 3-dimensional mixing matrices can be split into four disjoint subsets, which accordingly corresponds to the minimal number of additional, non-standard neutrinos. We show in numerical analysis that taking into account present experimental precision and fits to different neutrino mass splitting schemes, it is not possible to distinguish, on the level of 3-dimensional mixing matrices, between two and three extra neutrino states. It means that in 3+2 and 3+3 neutrino mixing scenarios, using the so-called alpha parametrization, ranges of non-unitary mixings are the same. However, on the level of a complete unitary 3+1 neutrino mixing matrix, using the dilation procedure and the Cosine-Sine decomposition, we were able to shrink bounds for the &quot;light-heavy&quot; mixing matrix elements. For instance, in the so-called seesaw mass scheme, a new upper limit on |U-e4| is about two times stringent than before and equals 0.021. For all considered mass schemes the lowest bounds are also obtained for all mixings, i.e. |U-e4|, |U-mu 4|, |U-tau 4|. New results obtained in this work are based on analysis of neutrino mixing matrices obtained from the global fits at the 95% CL.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10303 - Particles and field physics

Návaznosti výsledku

  • Projekt

  • Návaznosti

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2020

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název periodika

    JOURNAL OF HIGH ENERGY PHYSICS

  • ISSN

    1029-8479

  • e-ISSN

  • Svazek periodika

    Neuveden

  • Číslo periodika v rámci svazku

    3

  • Stát vydavatele periodika

    US - Spojené státy americké

  • Počet stran výsledku

    21

  • Strana od-do

    "Article Number: 169"

  • Kód UT WoS článku

    000522428900001

  • EID výsledku v databázi Scopus

    2-s2.0-85082749677