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arXiv 1705.03374hep-ex
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在$\sqrt{s}=8$ TeV质子-质子碰撞中用ATLAS探测器测量$b$ -强子对的产生

Measurement of $b$-hadron pair production with the ATLAS detector in proton-proton collisions at $\sqrt{s}=8$ TeV

ATLAS Collaboration

摘要:

测量的$b$ -强子对生产的基础上,相应的数据集的综合光度为11.4 FB $^{-1}$质子-质子碰撞记录在$\sqrt{s}=8$ TeV与ATLAS探测器在大型强子对撞机。选择事件,其中$b$ -强子在包含$J/ψ\rightarrow μμ$的衰变通道中重建,并且第二个$b$ -强子在包含μ子的衰变通道中重建。结果呈现在基准量定义的运动学要求的基础上,在分析中使用的三个μ子。测量基准横截面为$17.7 \pm 0.1 ($ stat。$) \pm 2.0 ($系统$)$编号还测量了许多归一化微分截面,并与Pythia 8,Herwig++,MadGraph5\_aMC@NLO+ Pythia 8和Sherpa事件发生器的预测进行比较,为重口味生产提供了新的约束。

英文摘要:

A measurement of $b$-hadron pair production is presented, based on a data set corresponding to an integrated luminosity of 11.4 fb$^{-1}$ of proton--proton collisions recorded at $\sqrt{s}=8$ TeV with the ATLAS detector at the LHC. Events are selected in which a $b$-hadron is reconstructed in a decay channel containing $J/ψ\rightarrow μμ$, and a second $b$-hadron is reconstructed in a decay channel containing a muon. Results are presented in a fiducial volume defined by kinematic requirements on three muons based on those used in the analysis. The fiducial cross section is measured to be $17.7 \pm 0.1 ($stat.$) \pm 2.0 ($syst.$)$ nb. A number of normalised differential cross sections are also measured, and compared to predictions from the Pythia8, Herwig++, MadGraph5\_aMC@NLO+Pythia8 and Sherpa event generators, providing new constraints on heavy flavour production.

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