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Background-independent measurement of theta(13) in Double Chooz
Journal article   Open access

Background-independent measurement of theta(13) in Double Chooz

Y. Abe, J. C. dos Anjos, J. C. Barriere, E. Baussan, I. Bekman, M. Bergevin, T. J. C. Bezerra, L. Bezrukov, E. Blucher, C. Buck, …
Physics letters. B, v 735, pp 51-56
30 Jul 2014
url
https://doi.org/10.1016/j.physletb.2014.04.045View
Published, Version of Record (VoR)CC BY V4.0 Open

Abstract

Astronomy & Astrophysics Physical Sciences Physics Physics, Nuclear Physics, Particles & Fields Science & Technology
The 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 theta(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 theta(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 sin(2)(2 theta(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 theta(13) that does not depend on a background model. (C) 2014 The Authors. Published by Elsevier B.V.

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Domestic collaboration
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Astronomy & Astrophysics
Physics, Nuclear
Physics, Particles & Fields
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