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短基线电子中微子消失、氚β衰变和无中子双β衰变

Short-Baseline Electron Neutrino Disappearance, Tritium Beta Decay and Neutrinoless Double-Beta Decay

Carlo Giunti, Marco Laveder

备注：
14 pages; final version published in Phys.Rev.D82:053005,2010
发表信息：
Phys.Rev.D82:053005,2010
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摘要：

我们考虑的MiniBooNE低能异常和镓放射性源实验异常的短基线电子中微子消失的3+1四中微子混合计划的框架内的解释。MiniBooNE和镓的数据分别进行拟合，结果是高度一致的，有效振荡参数Δ m^2和sin^2 2 θ的最佳拟合值非常接近。组合拟合得到Δ m^2 >~ 0.1 eV^2，2 σ时0.11 < sin^2 2 θ < 0.48。我们还考虑了Bugey和Tirzz反应堆反中微子振荡实验的数据和美因茨和Troitsk氚实验中得到的β衰变的有效电子反中微子质量的限制。这些实验数据的拟合将sin ^2 2 θ的值限制在2 σ时小于0.10。考虑到中微子MiniBooNE和镓数据与反中微子反应堆和氚数据之间的张力作为统计涨落，我们进行了组合拟合，得到Δ m^2 \simeq 2 eV和0.01 < sin^2 2 θ < 0.13（2 σ）。假设质量为m_1，m_2，m_3 << m_4，在2 σ处，β衰变和无中微子双β衰变中，m_4对有效中微子质量的贡献分别在0.06 ~ 0.49 eV和0.003 ~ 0.07 eV之间。我们还考虑了调和中微子MiniBooNE和镓数据和反中微子反应堆和氚数据与不同的混合在中微子和反中微子部门之间的紧张关系的可能性。我们发现一个混合角不对称的2.6西格玛指示。

英文摘要：

We consider the interpretation of the MiniBooNE low-energy anomaly and the Gallium radioactive source experiments anomaly in terms of short-baseline electron neutrino disappearance in the framework of 3+1 four-neutrino mixing schemes. The separate fits of MiniBooNE and Gallium data are highly compatible, with close best-fit values of the effective oscillation parameters Delta m^2 and sin^2 2 theta. The combined fit gives Delta m^2 >~ 0.1 eV^2 and 0.11 < sin^2 2 theta < 0.48 at 2 sigma. We consider also the data of the Bugey and Chooz reactor antineutrino oscillation experiments and the limits on the effective electron antineutrino mass in beta-decay obtained in the Mainz and Troitsk Tritium experiments. The fit of the data of these experiments limits the value of sin^2 2 theta below 0.10 at 2 sigma. Considering the tension between the neutrino MiniBooNE and Gallium data and the antineutrino reactor and Tritium data as a statistical fluctuation, we perform a combined fit which gives Delta m^2 \simeq 2 eV and 0.01 < sin^2 2 theta < 0.13 at 2 sigma. Assuming a hierarchy of masses m_1, m_2, m_3 << m_4, the predicted contributions of m_4 to the effective neutrino masses in beta-decay and neutrinoless double-beta-decay are, respectively, between about 0.06 and 0.49 and between about 0.003 and 0.07 eV at 2 sigma. We also consider the possibility of reconciling the tension between the neutrino MiniBooNE and Gallium data and the antineutrino reactor and Tritium data with different mixings in the neutrino and antineutrino sectors. We find a 2.6 sigma indication of a mixing angle asymmetry.

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