arXiv 1911.063422019-11-14hep-phhep-ex

来自新短程力的中微子味变换

Neutrino Flavor Transformations from New Short-Range Forces

B. J. P. Jones, J. Spitz

摘要：

我们研究了通常探索的秘密中微子力的超标准模型物理场景，并指出了一个似乎被忽视的模型预测：在以静止衰变（DAR）中微子源为特征的实验中产生独特的变味效应。这些味道的变化是因为驱动中微子和反中微子产生的衰变$μ^{+}\rightarrow e^+ +\barν_μ+ν_{e}$在末态产生两个中微子时是独一无二的。因此，当它们从彼此的势阱中逃逸时，出现的中微子之间的任何非味普适力都会引起一个新的振荡相位，这种效应在主要依赖于飞行中介子衰变和核衰变的实验中基本上不存在。我们计算了相关的可观察到的大小，并将其与LSND实验所看到的异常中微子味变换进行比较，找到了一个宽但受约束的允许参数空间。我们还评估了其他实验的现有限制，以及这种新效应在未来DAR程序JSNS $^2$和OscSNS中的可测试性。

英文摘要：

We examine the commonly explored beyond-standard-model physics scenario of secret neutrino forces, and point out a model prediction that appears to have been overlooked: the generation of unique flavor-changing effects in experiments featuring decay-at-rest (DAR) neutrino sources. These flavor changes occur because the decay that drives neutrino and antineutrino production, $μ^{+}\rightarrow e^+ +\barν_μ+ν_{e}$, is unique in producing two neutrinos in the final state. Any non-flavor-universal force between the emerging neutrinos would thus induce a new oscillation phase as they escape from each-other's potential wells, an effect which is largely absent in experiments that primarily rely on meson decay-in-flight and nuclear decay. We calculate the magnitude of the associated observable and compare it to the anomalous neutrino flavor transformation seen by the LSND experiment, finding a wide but constrained allowed parameter space. We also evaluate existing limits from other experiments, and the testability of this new effect at the future DAR programs JSNS$^2$ and OscSNS.

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摘要：

英文摘要：

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