arXiv 1705.047642017-05-12hep-phhep-ex

宇称破缺与希格斯粒子的暗力衰变

Parity Violation and Rare Higgs Decays from a Dark Force

Hooman Davoudiasl

备注：: Revtex4, 3 pages, one figure. Based on an invited talk of the same title presented by the author at the 22nd International Spin Symposium, September 25-30, 2016, at the University of Illinois Urbana-Champaign

摘要：

我们概述了“暗”$Z$的现象学，表示为$Z_d$，这是一个概括的“暗”光子假说。虽然暗光子通过动力学混合与标准模型相互作用，但$Z_d$也被假设与$Z$玻色子有质量混合。特别是，我们强调的可能性$Z_d$贡献低$Q^2$奇偶违反测量和罕见的希格斯衰变$H\to Z Z_d \to 4 \ell$，其中$\ell$是一个带电轻子。具有中等质量$\sim 10-35$ GeV的$Z_d$的宇称违反效应原则上可以缓解弱混合角$θ_W$的各种测量之间的温和的$\sim 1.8σ$张力。我们简要地评论了未来的奇偶违反实验在低$Q^2$探测这种情况下，这可能有相关的信号在罕见的希格斯衰变在大型强子对撞机的前景。

英文摘要：

We outline the phenomenology of the "dark" $Z$, denoted by $Z_d$, which is a generalization of the "dark" photon hypothesis. Whereas the dark photon interacts with the Standard Model through kinetic mixing, $Z_d$ is assumed also to have mass-mixing with the $Z$ boson. In particular, we highlight the possibility of $Z_d$ contributions to low $Q^2$ parity violation measurements and rare Higgs decays $H\to Z Z_d \to 4 \ell$, where $\ell$ is a charged lepton. The parity violation effects of a $Z_d$ with an intermediate mass $\sim 10-35$ GeV can in principle relieve the mild $\sim 1.8σ$ tension among various measurements of the weak mixing angle $θ_W$. We briefly comment on the prospects for future parity violation experiments at low $Q^2$ to probe this scenario, which could have correlated signals in rare Higgs decays at the LHC.

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摘要：

英文摘要：

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