论文标题
深色光子和深色$ z $中介$ b $梅森腐烂
Dark photon and dark $Z$ mediated $B$ meson decays
论文作者
论文摘要
我们在黑暗$ u（1）_d $型号中研究了$ b $ $ b $和$ k $ mesons的中性衰减，其深色光子/深色$ z $质量在10 mev和2 Gev之间。尽管该模型提供了改进的拟合度（与标准模型相比），以与$ b \至k^{（*）} \ ell^+ \ ell^ - $的差分衰减分布，带有$ \ ell =μ，e $，$ b_s \ to $ b_s \ to ncultion+ k^y+ k^y+ k.无形的$ decay和$ b_s -\ + Overline {b} _s $ Mixing等。为了避免低能数据的约束，我们扩展了模型，以允许（1）额外的$ z_d $衰减，（2）直接向量耦合到Muons $ z_d $，以及（3）$ z_d $的直接耦合到MUONS和ELCON，并通过电子耦合通过$ z_d来取消$ z_d $ c cout $ c cout yd $ c cout yd $ c cout yd $ cout yd。我们发现只有后一种情况才能幸存下来。
We study flavor changing neutral current decays of $B$ and $K$ mesons in the dark $U(1)_D$ model, with the dark photon/dark $Z$ mass between 10 MeV and 2 GeV. Although the model provides an improved fit (compared to the standard model) to the differential decay distributions of $B \to K^{(*)} \ell^+ \ell^-$, with $\ell= μ, e$, and $B_s \to ϕμ^+ μ^-$, the allowed parameter space is ruled out by measurements of atomic parity violation, $K^+ \to μ^+ + invisible$ decay, and $B_s - \overline{B}_s$ mixing, among others. To evade constraints from low energy data, we extend the model to allow for (1) additional invisible $Z_D$ decay, (2) a direct vector coupling of $Z_D$ to muons, and (3) a direct coupling of $Z_D$ to both muons and electrons, with the electron coupling fine-tuned to cancel the $Z_D$ coupling to electrons via mixing. We find that only the latter case survives all constraints.
