论文标题
探测山脉的HNL-ALP耦合
Probing HNL-ALP couplings at colliders
论文作者
论文摘要
轴突状颗粒（阿尔卑斯山）和重中性瘦素（HNL）都是标准模型的良好动机扩展。正如阿尔卑斯山夫妇与其质量成比例地进行壳费米子一样，涉及两种类型颗粒的过程可能会引起TEV HNLS的相关现象学。在这项工作中，我们指出了一个特别干净的过程，其最终状态由四个喷气机和两个带电的瘦素组成，我们估计其在LHC的当前和未来敏感性。对于壳HNL，i）i）对HNLS和活动中微子之间混合的整体规模不依赖，从而使此过程敏感到I型Seesaw系列； ii）该过程的信号强度仅在HNL质量低于几个TEV的范围内，与ALP耦合的质量相反。尽管在文献中主要对阿尔卑斯山和HNL进行了独立研究，但考虑到它们的相互作用可能导致关节限制，而关节限制比单独拍摄的单个颗粒上的相互限制要强得多。这项简洁的研究为对山脉和其他实验的类似搜索铺平了道路。
Axion-like particles (ALPs) and heavy neutral leptons (HNLs) are both well-motivated extensions of the Standard Model. As ALPs couple to on-shell fermions proportionally to their masses, processes involving both types of particles may give rise, for TeV HNLs, to relevant phenomenology at colliders. In this work, we point out a particularly clean process, whose final state consists of four jets and two charged leptons, and we estimate its current and future sensitivity at the LHC. For on-shell HNLs, i) there is no dependence on the overall scale of the mixing between HNLs and the active neutrinos, making this process sensitive down to the type-I Seesaw line; ii) the signal strength of the process is sizable only as far as the HNL masses are below a few TeVs, contrary to what the proportionality to masses of the ALP couplings may suggest. Although ALPs and HNLs have been mainly studied independently in the literature, considering their interplay may lead to joint limits that are much stronger than those on the individual particles taken separately. This concise study paves the way for similar searches at colliders and other experiments.
