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Invisible neutrino decay in the light of NOvA and T2K data
KTH, School of Engineering Sciences (SCI), Physics.ORCID iD: 0000-0002-6071-8546
Assam Don Bosco Univ, Tapesia Campus, Sonapur 782402, Assam, India..
Harish Chandra Res Inst, HBNI, Chhatnag Rd, Allahabad 211019, Uttar Pradesh, India..
2018 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 8, article id 141Article in journal (Refereed) Published
Abstract [en]

We probe for evidence of invisible neutrino decay in the latest NOvA and T2K data. It is seen that both NOvA and T2K data sets are better fitted when one allows for invisible neutrino decay. We consider a scenario where only the third neutrino mass eigenstate nu(3) is unstable and decays into invisible components. The best-fit value for the nu(3) lifetime is obtained as tau(3)/m(3) = 3.16 x 10(-12) s/eV from the analysis of the NOvA neutrino data and tau(3)/m(3) = 1.0x10(-11) s/eV from the analysis of the T2K neutrino and anti-neutrino data. The combined analysis of NOvA and T2K gives tau(3)/m(3) = 5.01 x 10(-12) s/eV as the best-fit lifetime. However, the statistical significance for this preference is weak with the no-decay hypothesis still allowed at close to 1.5 sigma C.L. from the combined data sets, while the two experiment individually are consistent with no-decay even at the 1 sigma C.L. At 3 sigma C.L., the NOvA and T2K data give a lower limit on the neutrino lifetime of tau(3)/m(3) is tau(3)/m(3) >= 7.22 x 10(-13) s/eV and tau(3)/m(3) >= 1.41 x 10(-12) s/eV, respectively, while NOvA and T2K combined constrain tau(3)/m(3) >= 1.50 x 10(-12) s/eV. We also show that in presence of decay the best-fit value in the sin(2) theta(23) vs. Delta m(32)(2) plane changes significantly and the allowed regions increase significantly towards higher sin(2) theta(23).

Place, publisher, year, edition, pages
Springer, 2018. no 8, article id 141
Keywords [en]
Neutrino Detectors and Telescopes (experiments), Oscillation
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-234600DOI: 10.1007/JHEP08(2018)141ISI: 000442699100010Scopus ID: 2-s2.0-85052001759OAI: oai:DiVA.org:kth-234600DiVA, id: diva2:1248262
Note

QC 20180914

Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2018-09-14Bibliographically approved

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Choubey, Sandhya

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