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arXiv 2006.13076hep-ex
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用ATLAS实验测量$\sqrt{s}=13\;$ TeV轻子+喷流通道中的$t\bar{t}$产生截面

Measurement of the $t\bar{t}$ production cross-section in the lepton+jets channel at $\sqrt{s}=13\;$TeV with the ATLAS experiment

ATLAS Collaboration

摘要:

$t\bar{t}$产生的截面是在轻子+喷流通道中使用质子$-$质子碰撞数据测量的,质量中心能量为$\sqrt{s}=13$ TeV,使用的是在LHC的ATLAS探测器。该数据集对应于139 fb $^{-1}$的积分光度。事件正好有一个带电轻子和四个或更多的喷流在最终状态,至少有一个喷流包含$b$ -强子,用于确定$t\bar{t}$生产截面通过配置文件的可能性拟合。测量的包容性截面为${σ_{\text{inc}} = 830 \pm 0.4~ \text{(stat.)}\pm 36~\text{(syst.)}\pm 14~\text{(lumi.)}~\mathrm{pb}}$,相对不确定度为4.6%。这一结果与微扰QCD中次-次-首阶的理论计算结果一致。还测量了在实验接受范围内的基准$t\bar{t}$截面。

英文摘要:

The $t\bar{t}$ production cross-section is measured in the lepton+jets channel using proton$-$proton collision data at a centre-of-mass energy of $\sqrt{s}=13$ TeV collected with the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 139 fb$^{-1}$. Events with exactly one charged lepton and four or more jets in the final state, with at least one jet containing $b$-hadrons, are used to determine the $t\bar{t}$ production cross-section through a profile-likelihood fit. The inclusive cross-section is measured to be ${σ_{\text{inc}} = 830 \pm 0.4~ \text{(stat.)}\pm 36~\text{(syst.)}\pm 14~\text{(lumi.)}~\mathrm{pb}}$ with a relative uncertainty of 4.6 %. The result is consistent with theoretical calculations at next-to-next-to-leading order in perturbative QCD. The fiducial $t\bar{t}$ cross-section within the experimental acceptance is also measured.

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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