Baseline-dependent neutrino oscillations with extra-dimensional shortcuts
Baseline-dependent neutrino oscillations with extra-dimensional shortcuts
复制标题
具有超维捷径的基线相关中微子振荡
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
T. Weiler
中科院分区：
文献类型：
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作者：
S. Hollenberg;O. Micu;H. Pas;T. Weiler
在额外维度的情况下，活跃中微子和惰性中微子之间的振荡可以由振荡振幅中的新共振来控制。当两个相位差抵消时，这种共振就产生了，通常的运动学相位差来自中微子质量的平方差，而几何相位差来自惰性中微子相对于被限制在膜上的活性中微子通过体的旅行时间的差。在这项工作中，我们为膜体系统引入了一个特定的度量，从中我们明确地推导出无菌中微子的额外维测地线，并最终推导出活性无菌双态系统的振荡概率。我们发现，对于非对称翘曲度规，共振条件涉及到中微子能量E和在膜上的传播距离L。换句话说，谐振能量可以看作是依赖于基线的。我们证明了一个很好的近似，共振条件不是在E或L上，而是在产物LE上。该模型具有丰富的含义，包括共振条件的多种解决方案的可能性，并对现有数据集（例如LSND和MiniBooNE）产生影响。讨论了膜体共振的一些现象学问题。
In extra-dimensional scenarios oscillations between active and sterile neutrinos can be governed by a new resonance in the oscillation amplitude. This resonance results when cancellation occurs between two phase differences, the usual kinematic one coming from the neutrino mass-squared difference, and a geometric one coming from the difference in travel times of the sterile neutrino through the bulk relative to the active neutrino confined to the brane. In this work we introduce a specific metric for the brane-bulk system, from which we explicitly derive extra-dimensional geodesics for the sterile neutrino, and ultimately the oscillation probability of the active-sterile two-state system. We find that for an asymmetrically warped metric, the resonance condition involves both the neutrino energy E and the travel distance L on the brane. In other words, the resonant energy may be viewed as baseline dependent. We show that to a good approximation, the resonance condition is not on E or on L, but rather on the product LE. The model is rich in implications, including the possibility of multiple solutions to the resonance condition, with ramifications for existing data sets, e.g., LSND and MiniBooNE. Some phenomenology with these brane-bulk resonances is discussed.