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dc.contributor.authorAbrahão, T.
dc.contributor.authorAlmazan, H.
dc.contributor.authordos Anjos, J. C
dc.contributor.authorAppel, S.
dc.contributor.authorBarriere, J. C
dc.contributor.authorBekman, I.
dc.contributor.authorBezerra, T. J C
dc.contributor.authorBezrukov, L.
dc.contributor.authorBlucher, E.
dc.contributor.authorBrugière, T.
dc.contributor.authorBuck, C.
dc.contributor.authorBusenitz, J.
dc.contributor.authorCabrera, A.
dc.contributor.authorCerrada, M.
dc.contributor.authorChauveau, E.
dc.contributor.authorChimenti, P.
dc.contributor.authorCorpace, O.
dc.contributor.authorDawson, J. V
dc.date.accessioned2021-09-20T17:41:28Z
dc.date.available2021-09-20T17:41:28Z
dc.date.issued2021-01-28
dc.identifier.urihttps://hdl.handle.net/1721.1/132020
dc.description.abstractAbstract A θ13 oscillation analysis based on the observed antineutrino rates at the Double Chooz far and near detectors for different reactor power conditions is presented. This approach provides a so far unique simultaneous determination of θ13 and the total background rates without relying on any assumptions on the specific background contributions. The analysis comprises 865 days of data collected in both detectors with at least one reactor in operation. The oscillation results are enhanced by the use of 24.06 days (12.74 days) of reactor-off data in the far (near) detector. The analysis considers the ν ¯ e $$ {\overline{\nu}}_e $$ interactions up to a visible energy of 8.5 MeV, using the events at higher energies to build a cosmogenic background model considering fast-neutrons interactions and 9Li decays. The background-model-independent determination of the mixing angle yields sin2(2θ13) = 0.094 ± 0.017, being the best-fit total background rates fully consistent with the cosmogenic background model. A second oscillation analysis is also performed constraining the total background rates to the cosmogenic background estimates. While the central value is not significantly modified due to the consistency between the reactor-off data and the background estimates, the addition of the background model reduces the uncertainty on θ13 to 0.015. Along with the oscillation results, the normalization of the anti-neutrino rate is measured with a precision of 0.86%, reducing the 1.43% uncertainty associated to the expectation.en_US
dc.publisherSpringer Berlin Heidelbergen_US
dc.relation.isversionofhttps://doi.org/10.1007/JHEP01(2021)190en_US
dc.rightsCreative Commons Attributionen_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.sourceSpringer Berlin Heidelbergen_US
dc.titleReactor rate modulation oscillation analysis with two detectors in Double Choozen_US
dc.typeArticleen_US
dc.identifier.citationJournal of High Energy Physics. 2021 Jan 28;2021(1):190en_US
dc.identifier.mitlicensePUBLISHER_CC
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2021-01-31T04:14:57Z
dc.language.rfc3066en
dc.rights.holderThe Author(s)
dspace.embargo.termsN
dspace.date.submission2021-01-31T04:14:57Z
mit.licensePUBLISHER_CC
mit.metadata.statusAuthority Work and Publication Information Needed


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