New limits on neutrino non-unitary mixings based on prescribed singular values
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
New limits on neutrino non-unitary mixings based on prescribed singular values
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
JOURNAL OF HIGH ENERGY PHYSICS
ISSN
1029-8479
e-ISSN
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Volume of the periodical
Neuveden
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
21
Pages from-to
"Article Number: 169"
UT code for WoS article
000522428900001
EID of the result in the Scopus database
2-s2.0-85082749677