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arXiv 2412.02477hep-ex
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在质心能量为 $\sqrt{s}$ = 13.6 TeV 的 pp 碰撞中测量包容性 WZ 产生截面

Measurement of the inclusive WZ production cross section in pp collisions at $\sqrt{s}$ = 13.6 TeV

CMS Collaboration

AI总结:

在质心能量为13.6 TeV的pp碰撞中,利用CMS探测器的多轻子末态和同时似然拟合测量了包容性WZ产生截面,结果与标准模型预测一致。

摘要:

在质心能量为 13.6 TeV 的质子-质子碰撞中测量了包容性 WZ 产生截面,使用的是 2022 年期间用 CMS 探测器收集的数据,对应于 34.7 fb$^{-1}$ 的积分光度。该测量使用了多轻子末态,并对四个不同轻子味类别(eee、ee$\mu$、$\mu\mu$e 和 $\mu\mu\mu$)中的事件数进行了同时似然拟合。选择经过优化以最小化背景事件数,并依赖于高效的即时轻子鉴别策略。WZ 产生截面是在围绕 Z 玻色子质量的 30 GeV 窗口内定义的相空间中测量的,结果为 $\sigma_{\text{total}}$(pp $\to$ WZ) = 55.2 $\pm$ 1.2 (stat) $\pm$ 1.2 (syst) $\pm$ 0.8 (lumi) $\pm$ 0.3 (theo) pb。此外,截面还在更接近探测器级要求的基准相空间中进行了测量。本文提出的所有测量结果均与标准模型预测一致。

英文摘要:

The inclusive WZ production cross section is measured in proton-proton collisions at a centre-of-mass energy of 13.6 TeV, using data collected during 2022 with the CMS detector, corresponding to an integrated luminosity of 34.7 fb$^{-1}$. The measurement uses multileptonic final states and a simultaneous likelihood fit to the number of events in four different lepton flavour categories: eee, ee$μ$, $μμ$e, and $μμμ$. The selection is optimized to minimize the number of background events, and relies on an efficient prompt lepton discrimination strategy. The WZ production cross section is measured in a phase space defined within a 30 GeV window around the Z boson mass, as $σ_{\text{total}}$(pp $\to$ WZ) = 55.2 $\pm$ 1.2 (stat) $\pm$ 1.2 (syst) $\pm$ 0.8 (lumi) $\pm$ 0.3 (theo) pb. In addition, the cross section is measured in a fiducial phase space closer to the detector-level requirements. All the measurements presented in this paper are in agreement with standard model predictions.

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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