arXiv 2204.047132022-04hep-phnucl-th

中子-中性粒子混合及其可观测结果

Neutron-neutral particle mixing and its observable consequences

Yongliang Hao, Dongdong Ni

备注：: 18 pages, 6 figures and 2 tables
DOI：: 10.1103/PhysRevD.106.115028

摘要：

本文研究了中子（$n$）与基本中性粒子（$η$）之间的混合，这种混合使重子数（$\mathcal{B}$）和轻子数（$\mathcal{L}$）都偏离一个单位，但保持了它们的差值$(\mathcal{B}-\mathcal{L})$。这种混合可能会产生不同于标准模型预测的非平凡效应。我们组织我们的讨论基于两种情况下，大致取决于振荡和衰减之间的干扰是否发生，或是否与$n$ - $η$混合的新物理效应有助于吸收混合振幅。如果一个振荡过程没有伴随着振荡和衰变之间的干涉，或者新物理相互作用对吸收混合振幅没有贡献，那么这样的过程可以被归类为纯振荡。否则，它可以被归类为不纯振荡。在纯振荡的情况下，由Majorana相引起的CP破坏可以通过$n$ - $\bar{n}$振荡过程表现出来，并可能导致可观察到的效应。在不纯振荡的情况下，我们分析了由$η$介导的$n$ - $\bar{n}$振荡所形成的质量本征态的质量和寿命的可检验意义.在这种情况下，我们还提出了一个统一的解释的中子寿命异常和$n$-$\bar{n}$振荡测量的基础上$n$-$η$混合。在这两种情况下，我们提出的$n$ - $\bar{n}$振荡的颜色多重态玻色子的质量上的实验搜索所施加的下限，并指出，它们可以在LHC或未来的高能实验的直接检测范围内。

英文摘要：

In this work, we explore the mixing between neutron ($n$) and elementary neutral particle ($η$), which violates both the baryon number ($\mathcal{B}$) and the lepton number ($\mathcal{L}$) by one unit but conserves their difference $(\mathcal{B}-\mathcal{L})$. Such mixing may give rise to non-trivial effects that are different from the Standard Model predictions. We organize our discussions based on two scenarios, roughly depending on whether an interference between oscillation and decay occurs, or whether the new-physics effects associated with the $n$-$η$ mixing contribute to the absorptive mixing amplitude. If an oscillation process is not accompanied by an interference between oscillation and decay, or the new-physics interactions do not contribute to the absorptive mixing amplitude, such a process can be classified as pure oscillation. Otherwise, it can be classified as impure oscillation. In the scenario of pure oscillation, CP-violation arising from the Majorana phase can manifest itself through the $n$-$\bar{n}$ oscillation process and may lead to observable effects. In the scenario of impure oscillation, we analyze the testable implications on the masses and lifetimes of the mass eigenstates formed as a result of the $n$-$\bar{n}$ oscillation mediated by $η$. In this scenario, we also suggest a unified interpretation of the neutron lifetime anomaly and the $n$-$\bar{n}$ oscillation measurements based on the $n$-$η$ mixing. In both scenarios, we present the lower bounds imposed by the experimental searches for $n$-$\bar{n}$ oscillations on the masses of the color multiplet bosons and point out that they could be within the reach of a direct detection at the LHC or future high-energy experiments.

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英文摘要：

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