1-s2.0-S0370269314002858-main.pdf (368.27 kB)
Background-independent measurement of ?13 in Double Chooz
journal contribution
posted on 2023-06-10, 01:46 authored by Y Abe, J C Dos Anjos, J C Barriere, E Baussan, I Bekman, M Bergevin, Thiago Sogo BezerraThiago Sogo Bezerra, L Bezrukov, E Blucher, C Buck, J Busenitz, A Cabrera, E Caden, L Camilleri, R Carr, Double Chooz Collaboration, othersThe oscillation results published by the Double Chooz Collaboration in 2011 and 2012 rely on background models substantiated by reactor-on data. In this analysis, we present a background-model-independent measurement of the mixing angle ?13 by including 7.53 days of reactor-off data. A global fit of the observed antineutrino rates for different reactor power conditions is performed, yielding a measurement of both ?13 and the total background rate. The results on the mixing angle are improved significantly by including the reactor-off data in the fit, as it provides a direct measurement of the total background rate. This reactor rate modulation analysis considers antineutrino candidates with neutron captures on both Gd and H, whose combination yields sin2(2?13) = 0.102 ± 0.028(stat.) ± 0.033(syst.). The results presented in this study are fully consistent with the ones already published by Double Chooz, achieving a competitive precision. They provide, for the first time, a determination of ?13 that does not depend on a background model.
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Publication status
- Published
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- Published version
Journal
Physics Letters BISSN
0370-2693Publisher
ElsevierExternal DOI
Volume
735Page range
51-56Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-11-16First Open Access (FOA) Date
2021-11-16First Compliant Deposit (FCD) Date
2021-11-12Usage metrics
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