Abe, Y, Dos Anjos, J C, Barriere, J C, Baussan, E, Bekman, I, Bergevin, M, Bezerra, T J C, Bezrukov, L, Blucher, E, Buck, C, Busenitz, J, Cabrera, A, Caden, E, Camilleri, L, Carr, R, Double Chooz Collaboration, and others, (2014) Background-independent measurement of <inf>θ13</inf> in Double Chooz. Physics Letters B, 735. pp. 51-56. ISSN 0370-2693

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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 θ13 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 θ13 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(2θ13) = 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 θ13 that does not depend on a background model.

Item Type:	Article
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor:	Mx Elements Account
Depositing User:	Mx Elements Account
Date Deposited:	16 Nov 2021 09:50
Last Modified:	16 Nov 2021 10:00
URI:	http://sro.sussex.ac.uk/id/eprint/102901

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