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 "light-heavy" 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 "light-heavy" 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