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arXiv 2102.08198hep-ex
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在$\sqrt{s} = $ 13 TeV质子-质子碰撞中寻找衰变为Z玻色子和希格斯玻色子的重矢量共振

Search for a heavy vector resonance decaying to a Z boson and a Higgs boson in proton-proton collisions at $\sqrt{s} = $ 13 TeV

CMS Collaboration

摘要:

寻找重矢量共振衰变为Z玻色子和标准模型希格斯玻色子玻色子,其中Z玻色子通过轻子衰变为电子、μ子或中微子来识别,而希格斯玻色子玻色子通过强子衰变来识别.该搜索是在洛伦兹增强机制下进行的,基于2016年至2018年在CERN LHC收集的数据,对应于137 fb $^{-1}$的积分亮度。上限推导出上生产的一个狭窄的重共振Z ',和质量低于3.5和3.7 TeV被排除在95%的置信水平的模型中,重矢量玻色子耦合专门费米子和玻色子,分别。这些是迄今为止对重矢量三重态Z'模型的最严格限制。如果重矢量玻色子只与标准模型玻色子耦合,则对于Z'质量在0.8和4.6 TeV之间的情况,截面和分支分数的乘积的上限分别设置在23和0.3 fb之间。这是第一个限制设置的重矢量玻色子耦合专门标准模型玻色子在其生产和衰变。

英文摘要:

A search is presented for a heavy vector resonance decaying into a Z boson and the standard model Higgs boson, where the Z boson is identified through its leptonic decays to electrons, muons, or neutrinos, and the Higgs boson is identified through its hadronic decays. The search is performed in a Lorentz-boosted regime and is based on data collected from 2016 to 2018 at the CERN LHC, corresponding to an integrated luminosity of 137 fb$^{-1}$. Upper limits are derived on the production of a narrow heavy resonance Z', and a mass below 3.5 and 3.7 TeV is excluded at 95% confidence level in models where the heavy vector boson couples exclusively to fermions and to bosons, respectively. These are the most stringent limits placed on the Heavy Vector Triplet Z' model to date. If the heavy vector boson couples exclusively to standard model bosons, upper limits on the product of the cross section and branching fraction are set between 23 and 0.3 fb for a Z' mass between 0.8 and 4.6 TeV, respectively. This is the first limit set on a heavy vector boson coupling exclusively to standard model bosons in its production and decay.

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