探测氚β衰变中的嗜中微子轴子类粒子
Probing Neutrinophilic Axion-Like Particles in Tritium Beta Decay
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中文总结 AI 辅助
本研究探讨利用KATRIN实验及其TRISTAN升级测量氚β衰变谱，以约束keV尺度嗜中微子轴子类粒子，并构建模型规避宇宙学限制，使该测量成为领先约束手段。
中文摘要 AI 辅助
我们研究了通过测量氚β衰变谱来约束嗜中微子轴子类粒子的前景，该测量由KATRIN实验及其计划的TRISTAN探测器升级执行。我们详细研究了由此产生的谱修正及相应的实验灵敏度。为进行比较，我们还讨论了相关的互补搜索，并推导出对keV尺度嗜中微子轴子类粒子的最新且稳健的约束，涵盖轻子数守恒和轻子数破坏两种相互作用。宇宙学约束通常更为严格；然而，这一结论依赖于粒子从早期宇宙至今保持不变的假设。因此，我们构建了一个模型，其中嗜中微子轴子类粒子作为扩展标量扇区的伪Nambu-Goldstone玻色子，从具有非平凡热历史的自发对称破缺中产生。我们表明该模型自然规避了常规宇宙学界限，使得氚β衰变测量能够提供领先的约束。
英文摘要
We investigate the prospects for constraining neutrinophilic axion-like particles via measurements of the tritium beta decay spectrum, as performed by the KATRIN experiment and its planned TRISTAN detector upgrade. We study in detail the resulting spectral modifications and the corresponding experimental sensitivity. The relevant complementary searches are also discussed for comparison and we derive the most up-to-date and robust constraints on keV-scale neutrinophilic axion-like particles, covering both lepton-number-conserving and lepton-number-violating interactions. Cosmological constraints are generally more stringent; however, this conclusion relies on the assumption that the particles remain unchanged from the early universe to the present day. We therefore construct a model in which the neutrinophilic axion-like particle, being a pseudo-Nambu-Goldstone boson of an extended scalar sector, emerges from a spontaneous symmetry breaking featuring a non-trivial thermal history. We show that the model naturally evades the conventional cosmological bounds, allowing tritium beta decay measurements to provide the leading constraints.
发表机构
- Institute for Basic Science (IBS)（基础科学研究所）
- Max-Planck-Institut für Kernphysik（马克斯·普朗克核物理研究所）
- Karlsruhe Institute of Technology (KIT)（卡尔斯鲁厄理工学院）
机构由 AI 辅助整理，请以论文原文为准。
