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arXiv 2004.10612hep-ex
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两个喷注和一个$Z$ -玻色子对的电弱产生的观测

Observation of electroweak production of two jets and a $Z$-boson pair

ATLAS Collaboration

摘要:

电弱对称性破缺解释了基本粒子通过与希格斯场的相互作用产生质量的原因。除了对希格斯玻色子玻色子性质的测量外,对自旋为1的大质量矢量玻色子散射的研究还可以探索电弱对称性破缺的本质。在所有与矢量玻色子散射有关的过程中,两个喷注和一个$Z$ -玻色子对的电弱产生是一个罕见而重要的过程。在这里,我们报告的观测质子质子碰撞数据对应的积分亮度为139/fb记录在一个中心的质量能量为13 TeV的ATLAS探测器在大型强子对撞机。我们考虑两个不同的最终状态起源于衰变的$Z$玻色子对-一个包含四个带电轻子和其他包含两个带电轻子和两个中微子。没有电弱产生的假设被拒绝,统计显著性为5.7 $σ$,电弱产生的测量截面与标准模型预测一致。此外,我们报告的横截面包容性生产的$Z$玻色子对和两个喷气机的两个最终状态。

英文摘要:

Electroweak symmetry breaking explains the origin of the masses of elementary particles through their interactions with the Higgs field. Besides the measurements of the Higgs boson properties, the study of the scattering of massive vector bosons with spin one allows the nature of electroweak symmetry breaking to be probed. Among all processes related to vector-boson scattering, the electroweak production of two jets and a $Z$-boson pair is a rare and important one. Here we report the observation of this process from proton-proton collision data corresponding to an integrated luminosity of 139/fb recorded at a centre-of-mass energy of 13 TeV with the ATLAS detector at the Large Hadron Collider. We consider two different final states originating from the decays of the $Z$-boson pair - one containing four charged leptons and the other containing two charged leptons and two neutrinos. The hypothesis of no electroweak production is rejected with a statistical significance of 5.7 $σ$, and the measured cross-section for electroweak production is consistent with the standard model prediction. In addition, we report cross-sections for inclusive production of a $Z$-boson pair and two jets for the two final states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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