Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 $$\text {TeV}$$ with the ATLAS detector
Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 $$\text {TeV}$$ with the ATLAS detector
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观察与孤立光子和缺失横向动量相关的两个射流的电弱产生，并使用 ATLAS 探测器寻找在 13 $$ ext {TeV}$$ 处衰变成不可见粒子的希格斯玻色子
DOI：
10.1140/epjc/s10052-021-09878-z
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Aad G
中科院分区：
文献类型：
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作者：
Aad G
本文测量了两个与APIR相关的喷注的电弱产生，其中Z玻色子衰变为两个中微子。它还介绍了寻找质量为125的希格斯玻色子的不可见或部分不可见的衰变，这些衰变是通过矢量玻色子与终态光子融合而产生的。这些结果使用了ATLAS探测器在13时从LHC质子-质子碰撞中收集的数据，对应的积分光度为139。所有用于测量和搜索的基准过程都具有事件特征，除了两个前向喷流外，事件特征还包括大量不平衡的横向动量和最终状态下的一个光子。在这种最终状态下，观察到与两个喷流相关的弱电产生，显著的标准偏差为5.2(预期为5.1)。这一过程的测量基准截面为ISFB。假设标准模型的产生截面，125Higgs玻色子与不可见粒子的分支比在95%的置信度下被设定为0.37()的观测(预期)上限。该签名也在希格斯玻色子衰变为光子和暗光子的背景下被解释。假设125Higgs玻色子的标准模型产生截面，观察到的(预期的)95%CL上限被设置为0.018()。
This paper presents a measurement of the electroweak production of two jets in association with apair, with theZboson decaying into two neutrinos. It also presents a search for invisible or partially invisible decays of a Higgs boson with a mass of 125produced through vector-boson fusion with a photon in the final state. These results use data from LHC proton–proton collisions at= 13collected with the ATLAS detector and corresponding to an integrated luminosity of 139. The event signature, shared by all benchmark processes considered for the measurements and searches, is characterized by a significant amount of unbalanced transverse momentum and a photon in the final state, in addition to a pair of forward jets. Electroweakproduction in association with two jets is observed in this final state with a significance of 5.2 (5.1 expected) standard deviations. The measured fiducial cross-section for this process isfb. An observed (expected) upper limit of 0.37 () at 95% confidence level is set on the branching ratio of a 125Higgs boson to invisible particles, assuming the Standard Model production cross-section. The signature is also interpreted in the context of decays of a Higgs boson into a photon and a dark photon. An observed (expected) 95% CL upper limit on the branching ratio for this decay is set at 0.018 (), assuming the Standard Model production cross-section for a 125Higgs boson.