论文标题
带有意外寿命的改变风味的轻玻色子
Flavor-changing light bosons with accidental longevity
论文作者
论文摘要
We consider a model with a complex scalar field that couples to $(e,μ)$ or $(μ,τ)$ within the "longevity" window: $[|m_{l_1} - m_{l_2}|, m_{l_1} + m_{l_2}]$ in which $l_1$ and $l_2$ are the two different charged leptons.在这样的质量窗口中，即使是一个相对较大的耦合（例如，在MUON $ G-2 $实验中与当前的准确性/差异相称的大小）也会导致长寿，并且生产和衰减点之间的宏观传播距离。我们建议利用几个现有的中微子实验和一个将来的实验，以探测该模型的参数空间。对于$μ-e $行业，我们利用LSND实验的Muonium衰减分支比和生产和衰减序列，不包括$G_μ-2$异常建议的参数区域。对于$τ-μ$扇区，我们分析了光束转储实验中标量的三种主要生产机制：DRELL-YAN过程，重的介子衰变和MUON散射。我们探讨了过去的魅力和NUTEV实验的约束，并评估了提议的梁转储实验船的灵敏度。后者可以彻底探测与$G_μ-2 $异常相关的参数空间。
We consider a model with a complex scalar field that couples to $(e,μ)$ or $(μ,τ)$ within the "longevity" window: $[|m_{l_1} - m_{l_2}|, m_{l_1} + m_{l_2}]$ in which $l_1$ and $l_2$ are the two different charged leptons. Within such a mass window, even a relatively large coupling (e.g. of the size commensurate with the current accuracy/discrepancy in the muon $g-2$ experiment) leads to long lifetimes and macroscopic propagation distance between production and decay points. We propose to exploit several existing neutrino experiments and one future experiment to probe the parameter space of this model. For the $μ-e$ sector, we exploit the muonium decay branching ratio and the production and decay sequence at the LSND experiment, excluding the parametric region suggested by $g_μ-2$ anomaly. For the $τ-μ$ sector, we analyze three main production mechanisms of scalars at beam dump experiments: the Drell-Yan process, the heavy meson decay, and the muon scattering. We explore the constraints from the past CHARM and NuTeV experiments, and evaluate sensitivity for the proposed beam dump experiment, SHiP. The latter can thoroughly probe the parameter space relevant for the $g_μ- 2$ anomaly.
