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Constraining sterile neutrinos using reactor neutrino experiments
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0002-3525-8349
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2014 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 8Article in journal (Refereed) Published
Abstract [en]

Models of neutrino mixing involving one or more sterile neutrinos have resurrected their importance in the light of recent cosmological data. In this case, reactor antineutrino experiments offer an ideal place to look for signatures of sterile neutrinos due to their impact on neutrino flavor transitions. In this work, we show that the high-precision data of the Daya Bay experiment constrain the 3+1 neutrino scenario imposing upper bounds on the relevant active-sterile mixing angle sin(2) 2 theta(14) less than or similar to 0.06 at 3 sigma confidence level for the mass-squared difference Delta m(41)(2) in the range (10(-3), 10(-1)) eV(2). The latter bound can be improved by six years of running of the JUNO experiment, sin(2) 2 theta(14) less than or similar to 0.016, although in the smaller mass range Delta m(41)(2) is an element of(10(-4), 10(-3)) eV(2). We have also investigated the impact of sterile neutrinos on precision measurements of the standard neutrino oscillation parameters theta(13) and Delta m(31)(2) (at Daya Bay and JUNO), theta(12) and Delta m(21)(2) (at JUNO), and most importantly, the neutrino mass hierarchy (at JUNO). We find that, except for the obvious situation where Delta m(41)(2) similar to Delta m(31)(2), sterile states do not affect these measurements substantially.

Place, publisher, year, edition, pages
2014. no 8
Keyword [en]
Neutrino Physics, Beyond Standard Model
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URN: urn:nbn:se:kth:diva-160002DOI: 10.1007/JHEP08(2014)057ISI: 000347891800003Scopus ID: 2-s2.0-84905994241OAI: oai:DiVA.org:kth-160002DiVA: diva2:789299
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QC 20150218

Available from: 2015-02-18 Created: 2015-02-12 Last updated: 2017-12-04Bibliographically approved

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Ohlsson, Tommy

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