arXiv 2306.074132023-06hep-ex

利用ATLAS探测器在稀有Z玻色子衰变中寻找暗光子

Search for Dark Photons in Rare $Z$ Boson Decays with the ATLAS Detector

ATLAS Collaboration

备注：: 33 pages in total, author list starting page 16, 6 figures, 1 table, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2019-32/
发表信息：: Phys. Rev. Lett. 131 (2023) 251801
DOI：: 10.1103/PhysRevLett.131.251801

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AI总结：

本研究利用ATLAS探测器的139 fb⁻¹质子-质子碰撞数据，在稀有Z玻色子衰变中搜寻暗光子，对相关耦合与动力学混合的乘积设置了上限，探索了新的参数空间。

摘要：

本文利用大型强子对撞机上ATLAS探测器记录的质心系能量√s=13 TeV、积分亮度139 fb⁻¹的质子-质子碰撞数据，开展了通过标准模型Z玻色子稀有衰变产生暗光子与暗希格斯玻色子伴随产生事件的搜寻研究。暗希格斯玻色子衰变为一对暗光子，三个暗光子中至少两个需分别衰变为一对电子或μ子，导致末态至少存在两对同味异号轻子对。研究发现数据与背景预测一致，在暗光子质量区间[5, 40] GeV（Υ质量窗口[8.8, 11.1] GeV除外）内，对暗光子与暗希格斯玻色子的耦合乘以标准模型光子与暗光子的动力学混合量α_Dε²设置了上限。该搜寻探索了此前未被其他实验排除的新参数空间。

英文摘要：

A search for events with a dark photon produced in association with a dark Higgs boson via rare decays of the Standard Model $Z$ boson is presented, using 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider. The dark Higgs boson decays into a pair of dark photons, and at least two of the three dark photons must each decay into a pair of electrons or muons, resulting in at least two same-flavor opposite-charge lepton pairs in the final state. The data are found to be consistent with the background prediction, and upper limits are set on the dark photon's coupling to the dark Higgs boson times the kinetic mixing between the Standard Model photon and the dark photon, $α_{D}\varepsilon^2$, in the dark photon mass range of $[5, 40]$ GeV except for the $Υ$ mass window $[8.8, 11.1]$ GeV. This search explores new parameter space not previously excluded by other experiments.

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