论文标题
黑暗媒介衰变中黑暗部门的新型多勒普顿特征
Novel multi-lepton signatures of dark sectors in light meson decays
论文作者
论文摘要
我们指出，Kaon腐烂了多个带电的Leptons，这是一种新颖的浅色粒子$ x $的探针。以前被忽略的频道，例如$ k^+\toπ^+\ left（xx \ to 2（e^+e^ - ）\右）$，$ k_l \ toπ^0 \ left（xx \ to 2（e^+e^ - e^ - ）\右）$，以及$ k_s \ weft（$ k_s \ weft）（x x \ weft）（xx \ weft）（x x x x x x x x x x o^y May \ e \ e^2（e^os）不仅是标准模型期望，而且还可能的背景，例如中性亲的达利兹（Dalitz）衰减。我们将这个想法应用于黑暗扇区模型，在这些模型中，深色希格斯或重型中性瘦素的产生会导致具有几个可见的深色光子的最终状态。我们还研究了MEV尺度QCD轴的最近提出的模型，在该模型中，由于轴与光中膜的非线性相互作用，KAON对多轴状状态的速率很大。此外，我们还指出了Pion衰减中此轴的新探针，例如$π^+\ $ a $ a $ a $ a $ a $ a $ a $ a \ weft（（E^+）^* \ to e^+a \ to e^+e^+e^+e^+e^ - \ right）$，pion captuce $π^ - +（p \ f text^ - p \ f text {或d n n n in of toper \至2（e^+e^ - ）+（n \ text {or} nn）$，以及$π^0 \ to aaa \ to 3（e^+e^ - ）$。后者的衰减固定在$ \ Mathcal {b}（π^0 \ a a a）= 1.0 \ times 10^{ - 3} $的$ 17 $ mev axion。
We point out kaon decays to multiple charged leptons as a novel probe of light dark particles $X$. Previously neglected channels, such as $K^+\to π^+ \left(XX \to 2(e^+e^-)\right)$, $K_L\to π^0 \left( XX \to 2(e^+e^-)\right)$, and $K_S\to \left(XX \to 2(e^+e^-)\right)$ may have very large rates, exceeding not only the Standard Model expectations but also possible backgrounds, such as Dalitz decays of neutral pions. We apply this idea to dark sector models where the production of dark Higgses or heavy neutral leptons leads to final states with several visible dark photons. We also investigate a recently proposed model of an MeV-scale QCD axion, where the rates for kaon decays to multiple axion states are large due to the non-linear interactions of the axion with the light mesons. In addition, we point out new probes of this axion in pion decays, such as the single production of $a$ in $π^+ \to ν\left((e^+)^* \to e^+ a\to e^+e^+e^-\right)$, double production in pion capture $π^-+(p \text{ or D})\to aa + (n\text{ or }nn) \to 2(e^+e^-) + (n\text{ or }nn)$, as well as $π^0 \to aaa\to 3(e^+e^-)$. The latter decay is fixed at $\mathcal{B}(π^0\to a a a) = 1.0 \times 10^{-3}$ for a $17$ MeV axion.
