Abstract

The production of a Z boson in association with a high-energy photon (γ) in proton-proton collisions has been studied at the Large Hadron Collider (LHC). These studies have been used to test the electroweak sector of the Standard Model and to search for new physics effects, such as potential couplings of Z bosons to photons. The Zγ production with the Z boson decaying into neutrinos has been measured with data collected by the ATLAS detector during the 2015–2016 period at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 36.1 fb^–1. Candidate Zγ events with invisible decays of the Z boson are selected by requiring significant transverse momentum \(({{p}_{T}})\) of the neutrinos system in conjunction with a single isolated photon with large transverse energy (E_T). Evidence of anomalous triple gauge-boson couplings is sought in Zγ production with photon E_T greater than 600 GeV. No excess is observed relative to the Standard Model expectation, and upper limits are set on the strength of ZZγ and Zγγ couplings.

中文翻译：

---

$$ {\ mathbf {Z}}（\ nu \ bar {\ nu}）\ gamma $$使用ATLAS探测器在13 TeV处测量和中性a TGC限制

摘要

生产的ž关联玻色子具有高能量光子（γ）在质子-质子碰撞已经研究在大型强子对撞机（LHC）。这些研究已用于测试标准模型的电弱部分，并寻找新的物理效应，例如Z玻色子与光子的潜在耦合。所述ž γ的生产Ž玻色子衰变成中微子已经用期间，在13 TeV对的中心的质量能量2015-2016期间由ATLAS检测器收集并对应于36.1 fb的一个集成的光度数据测量^-1。候选ž γ与无形的衰变事件ž通过要求中微子系统具有明显的横向动量\（（{{p} _ {T}}）\）来选择玻色子，并结合具有大横向能量（E _T）的单个孤立光子。反常三重计玻色子耦合的证据寻求在ż γ生产与光子Ë _Ť大于600 GeV的。没有多余的是相对于标准模型期望观察到的，和上限在上的强度设定ZZ γ和Ž γγ耦合。