Abe2016_Article_MeasurementOfth13InDoubleChoozU.pdf (2.24 MB)
Measurement of ?13 in Double Chooz using neutron captures on hydrogen with novel background rejection techniques
journal contribution
posted on 2023-06-10, 01:45 authored by Y Abe, S Appel, T Abrahão, H Almazan, C Alt, J C dos Anjos, J C Barriere, E Baussan, I Bekman, M Bergevin, Thiago Sogo BezerraThiago Sogo Bezerra, L Bezrukov, E Blucher, T Brugière, C Buck, The Double Chooz collaboration, othersThe Double Chooz collaboration presents a measurement of the neutrino mixing angle ?13 using reactor ?e¯ (Formula presented.) observed via the inverse beta decay reaction in which the neutron is captured on hydrogen. This measurement is based on 462.72 live days data, approximately twice as much data as in the previous such analysis, collected with a detector positioned at an average distance of 1050 m from two reactor cores. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties. Accidental coincidences, the dominant background in this analysis, are suppressed by more than an order of magnitude with respect to our previous publication by a multi-variate analysis. These improvements demonstrate the capability of precise measurement of reactor ?e¯ (Formula presented.) without gadolinium loading. Spectral distortions from the ?e¯ (Formula presented.) reactor flux predictions previously reported with the neutron capture on gadolinium events are confirmed in the independent data sample presented here. A value of sin2 2?13 = 0.095- 0.039+ 0.038 (stat+syst) is obtained from a fit to the observed event rate as a function of the reactor power, a method insensitive to the energy spectrum shape. A simultaneous fit of the hydrogen capture events and of the gadolinium capture events yields a measurement of sin2 2?13 = 0.088 ± 0.033(stat+syst).
History
Publication status
- Published
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- Published version
Journal
Journal of High Energy PhysicsISSN
1126-6708Publisher
SpringerExternal DOI
Volume
2016Page range
1-26Article number
a163Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-11-15First Open Access (FOA) Date
2021-11-15First Compliant Deposit (FCD) Date
2021-11-12Usage metrics
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