论文标题
通过$ ZH $生产搜索Higgs Boson衰减的黑暗光子，并带有光子以及缺少$ pp $ collisions的横向动量签名，$ \ sqrt {s} $ = 13 TEV与Atlas检测器
Search for dark photons from Higgs boson decays via $ZH$ production with a photon plus missing transverse momentum signature from $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
论文作者
论文摘要
本文介绍了在$ \ sqrt {s} = 13 $ tev的质子proton碰撞中搜索深色光子（$γ_d$）的搜索。通过$ ZH $生产模式产生的希格斯玻色子（$ h \toγγ_d$）的衰减中搜索了深色光子。系统的横向质量由光子制成，而从非相互作用的$γ_D$制成的横向动量则在Higgs玻色子质量附近达到峰值时，具有独特的签名。呈现的结果使用总Atlas检测器在LHC记录的139 fb $^{ - 1} $的总Run-2集成光度。使用数据驱动的技术估算了主要的还原背景过程。采用增强决策树技术来增强搜索的敏感性。由于在标准模型预测方面没有观察到过多，因此观察到的（预期的）上限对分支比$（H \toγγ_D）$ 2.28 $ \％$（2.82 $^{+1.33} _ { - 0.84} \％$）设置为95 $ \％$ clless $ clless $ cl $γ_D。对于高达40 GEV的大量深色光子，在[2.19,2.52] $ \％$（[2.71,3.11] $ \％$ $）范围内发现了在95 \％置信度下观察到的（预期的）上限（预期）上限（H \至γγ_D）$。
This paper describes a search for dark photons ($γ_d$) in proton-proton collisions at $\sqrt{s}=13$ TeV at the Large Hadron Collider (LHC). The dark photons are searched for in the decay of Higgs bosons ($H \to γγ_d$) produced through the $ZH$ production mode. The transverse mass of the system, made of the photon and the missing transverse momentum from the non-interacting $γ_d$, presents a distinctive signature as it peaks near the Higgs boson mass. The results presented use the total Run-2 integrated luminosity of 139 fb$^{-1}$ recorded by the ATLAS detector at the LHC. The dominant reducible background processes are estimated using data-driven techniques. A Boosted Decision Tree technique is adopted to enhance the sensitivity of the search. As no excess is observed with respect to the Standard Model prediction, an observed (expected) upper limit on the branching ratio BR$(H\to γγ_d)$ of 2.28$\%$ (2.82$^{+1.33}_{-0.84}\%$) is set at 95$\%$ CL for massless $γ_d$. For massive dark photons up to 40 GeV, the observed (expected) upper limits on BR$(H\to γγ_d)$ at 95\% confidence level is found within the [2.19,2.52]$\%$ ([2.71,3.11]$\%$) range.
