论文标题
在$ e^+e^ - $ colliders中探测Dimension-8中性量规耦合中的新物理
Probing New Physics in Dimension-8 Neutral Gauge Couplings at $e^+e^-$ Colliders
论文作者
论文摘要
在标准模型的有效理论中不存在中性三重量规耦合（NTGC），直到尺寸6运算符，但可能来自Dimension-8有效运算符。在这项工作中，我们研究了Dimension-8的纯仪表运营商，该操作员对NTGC有贡献，并且独立于涉及HIGGS DoubleT的Dimension-8操作员。我们表明，纯量规操作员同时生成$zγZ^*$和$zγγ^*$ restice $ \ propto e^5 $的顶点，可以通过反应$ e^+e^+e^ - \ tozγ$敏感地探测。我们证明，通过反应测量NTGC $ e^+e^ - \ tozγ$，然后是$ z \ to q \ bar {q} $衰减可以探测dimension-8纯度计量的新物理量表，直至范围$（1-5）$（1-5）$（1-5）$ tev tev，fcc-ee和fcc-ee和Ilc colders colders colders culiders colders colders $（1-5） $ \ sqrt {s} =（0.25-1）$ tev，最高范围$（10-16）$（10-16）$ tev at clic at clic，with $ \ sqrt {s} =（3-5）$ tev，在每种情况下都有5/ab的集成亮度为5/ab。我们将这些敏感性与涉及HIGGS Doubleets的Dimension-8 NTGC操作员的相应探针进行了比较，并将尺寸-8的Fermionic接触式操作员与$ e^+e^+e^-zγ$ pertex有助于。
Neutral triple gauge couplings (nTGCs) are absent in the standard model effective theory up to dimension-6 operators, but could arise from dimension-8 effective operators. In this work, we study the pure gauge operators of dimension-8 that contribute to nTGCs and are independent of the dimension-8 operator involving the Higgs doublet. We show that the pure gauge operators generate both $ZγZ^*$ and $Zγγ^*$ vertices with rapid energy dependence $\propto E^5$, which can be probed sensitively via the reaction $e^+e^- \to Zγ$. We demonstrate that measuring the nTGCs via the reaction $e^+e^- \to Zγ$ followed by $Z \to q\bar{q}$ decays can probe the new physics scales of dimension-8 pure gauge operators up to the range $(1-5)$TeV at the CEPC, FCC-ee and ILC colliders with $\sqrt{s}=(0.25-1)$TeV, and up to the range $(10-16)$TeV at CLIC with $\sqrt{s}=(3-5)$TeV, assuming in each case an integrated luminosity of 5/ab. We compare these sensitivities with the corresponding probes of the dimension-8 nTGC operators involving Higgs doublets and the dimension-8 fermionic contact operators that contribute to the $e^+e^-Zγ$ vertex.
