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Journal Article

Background-independent measurement of θ13 in Double Chooz

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30347

Buck,  C.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30570

Haser,  Julia
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30647

Kaether,  F.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30768

Lindner,  M.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons31154

Wagner,  Stefan
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons37605

Watanabe,  H.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

Fulltext (public)

1401.5981.pdf
(Preprint), 177KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Double Chooz Collaboration, Abe, Y., Anjos, J. C. d., Barriere, J. C., Baussan, E., Bekman, I., et al. (2014). Background-independent measurement of θ13 in Double Chooz. Physics Letters B, 735, 51-56. doi:10.1016/j.physletb.2014.04.045.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0025-0501-B
Abstract
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 neutrino 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 $\pm$ 0.028(stat.) $\pm$ 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.