论文标题
Kaon腐烂在无质量的深色光子上脱光灯
Kaon decays shedding light on massless dark photons
论文作者
论文摘要
我们探索了Kaon腐烂的腐烂，缺少无质量的深色光子（$ \barγ$）带来的能量，假定会改变风味的偶极型耦合到$ d $和$ s $ quarks。我们特别考虑中性kaon模式$ k_l \toγ\barγ$和$ k_l \toπ^0γ\barγ$及其$ k_s $对应器，以及带电的Kaon通道$ k^+\toπ^+\toπ^+γ\barγ$，每个都有一个普通的光子光子，$γ$。此外，我们查看$ k_ {l，s} \toπ^+π^ - \barγ$和$ k^+\toπ^+π^0 \barγ$。有趣的是，相同的$ ds \barγ$相互作用会导致能量丢失的超子的两体衰减产生，并且受模型独立的约束，可以从现有的超子数据中推断出来。考虑到这一点，我们获得了分支分数$ {\ cal b}（k_l \toγ\barγ）$和$ {\ cal b}（k_l \toπ^0γ\barγ）$，可以分别高达$ 10^{ - 3} $ and $ 10^{ - 6} $，可以分别触及，这是一个可以触及的$ 10^{ - 3} $和$ 10^{ - 6} $。此外，我们发现$ {\ cal b}（k^+\toπ^+γ\barγ）$和$ {\ cal b}（k^+\toπ^+π^0 \barγ）$可以最大地为$ 10^{ - 6} $的顺序，并且可以通过NA62验证。补充，超子模式可以具有besiii可能可以访问的速率。因此，这些正在进行的实验很快就可以对无质量的深色光子的存在进行重大测试。
We explore kaon decays with missing energy carried away by a massless dark photon, $\barγ$, assumed to have flavor-changing dipole-type couplings to the $d$ and $s$ quarks. We consider in particular the neutral-kaon modes $K_L\toγ\barγ$ and $K_L\toπ^0γ\barγ$ and their $K_S$ counterparts, as well as the charged-kaon channel $K^+\toπ^+γ\barγ$, each of which also has an ordinary photon, $γ$, in the final state. In addition, we look at $K_{L,S}\toπ^+π^-\barγ$ and $K^+\toπ^+π^0\barγ$. Interestingly, the same $ds\barγ$ interactions give rise to the flavor-changing two-body decays of hyperons with missing energy and are subject to model-independent constraints that can be inferred from the existing hyperon data. Taking this into account, we obtain branching fractions ${\cal B}(K_L\toγ\barγ)$ and ${\cal B}(K_L\toπ^0γ\barγ)$ which can be as high as $10^{-3}$ and $10^{-6}$, respectively, one or both of which may be within the sensitivity reach of the KOTO experiment. Furthermore, we find that ${\cal B}(K^+\toπ^+γ\barγ)$ and ${\cal B}(K^+\toπ^+π^0\barγ)$ are allowed to be maximally of order $10^{-6}$ as well, which may be probed by NA62. Complementarily, the hyperon modes can have rates which are potentially accessible by BESIII. Thus, these ongoing experiments could soon be able to offer significant tests on the existence of the massless dark photon.
