重中性轻子的ATLAS边界在实际中微子振荡模型中的重新解释
Reinterpreting the ATLAS bounds on heavy neutral leptons in a realistic neutrino oscillation model
摘要：
重中性轻子（HNL）是一种假想的粒子，最初的动机是它们能够解释中微子振荡。对HNL的实验研究通常是在假设单一HNL与单一中微子味混合的情况下进行的。然而，由此产生的排斥限制可能不会直接限制现实HNL模型中相应的混合角-那些可以解释中微子振荡的混合角。这些实验搜索结果的重新解释原来是一个不平凡的任务，这需要大量的实验细节的知识。在这项工作中，我们执行的最新的ATLAS搜索HNL迅速衰减到三轻子最终状态的重新解释。我们表明，在一个现实的模型与两个HNL，实际限制可以变化几个数量级，这取决于模型的自由参数。在未知模型参数上边缘化导致对总混合角的排除限制，其可以比arXiv：1905.09787中报告的限制弱多达3个数量级。这表明，重新解释实验搜索的结果是获得现实模型有意义的限制的必要步骤。我们详细介绍了实验合作可以采取的几个步骤，以简化其结果的重用。
英文摘要：
Heavy neutral leptons (HNLs) are hypothetical particles, motivated in the first place by their ability to explain neutrino oscillations. Experimental searches for HNLs are typically conducted under the assumption of a single HNL mixing with a single neutrino flavor. However, the resulting exclusion limits may not directly constrain the corresponding mixing angles in realistic HNL models -- those which can explain neutrino oscillations. The reinterpretation of the results of these experimental searches turns out to be a non-trivial task, that requires significant knowledge of the details of the experiment. In this work, we perform a reinterpretation of the latest ATLAS search for HNLs decaying promptly to a tri-lepton final state. We show that in a realistic model with two HNLs, the actual limits can vary by several orders of magnitude depending on the free parameters of the model. Marginalizing over the unknown model parameters leads to an exclusion limit on the total mixing angle which can be up to 3 orders of magnitude weaker than the limits reported in arXiv:1905.09787. This demonstrates that the reinterpretation of results from experimental searches is a necessary step to obtain meaningful limits on realistic models. We detail a few steps that can be taken by experimental collaborations in order to simplify the reuse of their results.
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