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在质子-质子碰撞 $\sqrt{s}$ = 13 TeV 的双轻子特征事件中搜寻重复合马约拉纳中微子

Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at $\sqrt{s}$ = 13 TeV

CMS Collaboration

备注：
Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-20-011 (CMS Public Pages)
发表信息：
Phys. Lett. B 843 (2023) 137803
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AI总结：

本文利用 CMS 在 13 TeV 质子-质子碰撞中收集的 138 fb⁻¹ 数据，搜寻衰变为双轻子与夸克对的重复合马约拉纳中微子，未发现超出标准模型的迹象，并设定了更严格的排除上限。

摘要：

本文展示了对重马约拉纳中微子 N$_\ell$ 衰变为两个同味轻子 $\ell$（电子或缪子）与一对夸克喷注的搜寻结果。研究考虑了一个模型，其中 N$_\ell$ 是复合场景下的激发态中微子。本分析使用 CMS 实验在 CERN LHC 上记录的 $\sqrt{s}$ = 13 TeV 质子-质子碰撞样本，对应 138 fb$^{-1}$ 的积分亮度。数据与标准模型预测相符。对于伴随轻子产生 N$_\ell$，随后 N$_\ell$ 衰变为同味轻子和夸克对的过程，获得了 95% 置信水平下截面与分支比乘积的上限，作为 N$_\ell$ 质量 $m_{\text{N}_\ell}$ 和复合尺度 $Λ$ 的函数。对于此模型，在 $m_{\text{N}_\ell}$ 等于 $Λ$ 的极限下，数据排除了 $m_{\text{N}_\ell}$ 低于 6.0 (6.1) TeV 的 N$_\text{e}$ (N$_μ$) 的存在。当 $m_{\text{N}_\ell}$ $\approx$ 1 TeV 时，排除了 $Λ$ 小于 20 (23) TeV 的值。这些结果在灵敏度上有显著提升，覆盖了比以往 13 TeV pp 碰撞搜寻更大的参数空间。

英文摘要：

Results are presented of a search for a heavy Majorana neutrino N$_\ell$ decaying into two same-flavor leptons $\ell$ (electrons or muons) and a quark-pair jet. A model is considered in which the N$_\ell$ is an excited neutrino in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at $\sqrt{s}$ = 13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb$^{-1}$. The data are found to be in agreement with the standard model prediction. For the process in which the N$_\ell$ is produced in association with a lepton, followed by the decay of the N$_\ell$ to a same-flavor lepton and a quark pair, an upper limit at 95% confidence level on the product of the cross section and branching fraction is obtained as a function of the N$_\ell$ mass $m_{\text{N}_\ell}$ and the compositeness scale $Λ$. For this model the data exclude the existence of N$_\text{e}$ (N$_μ$) for $m_{\text{N}_\ell}$ below 6.0 (6.1) TeV, at the limit where $m_{\text{N}_\ell}$ is equal to $Λ$. For $m_{\text{N}_\ell}$ $\approx$ 1 TeV, values of $Λ$ less than 20 (23) TeV are excluded. These results represent a considerable improvement in sensitivity, covering a larger parameter space than previous searches in pp collisions at 13 TeV.

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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