Background-independent measurement of θ13 in Double Chooz
Background-independent measurement of θ13 in Double Chooz
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DOI：
10.1016/j.physletb.2014.04.045
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发表时间：
2014-07-30
影响因子：
4.4
通讯作者：
Zimmer, V.
中科院分区：
文献类型：
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作者：
Abe, Y.;dos Anjos, J. C.;Zimmer, V.
2011年和2012年，Double Republiz合作组织发表的振荡结果依赖于由反应堆运行数据证实的背景模型。在该分析中，我们通过包括7.53天的反应堆关闭数据来提供混合角θ（13）的背景模型无关测量。不同反应堆功率条件下观测到的反中微子速率进行了全局拟合，得到了θ（13）和总背景速率的测量值。通过在拟合中包括反应堆关闭数据，混合角的结果得到显著改善，因为它提供了总背景速率的直接测量。该反应堆速率调制分析考虑在Gd和H上具有中子捕获的反中微子候选物，其组合产生sin（2）（2 θ（13））= 0.102 +/- 0.028（stat.）+/- 0.033（系统）。本研究中给出的结果与DoubleDrouz已经发表的结果完全一致，达到了具有竞争力的精度。它们第一次提供了不依赖于背景模型的θ（13）的确定。(C)2014作者由爱思唯尔公司出版
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.