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arXiv 2108.11650hep-ex
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用ATLAS探测器在$\sqrt{s} = 13$ TeV上用PDMATHAAC碰撞中的衰变$B^{\pm} \to J/ψK^{\pm}$测量喷注中的$b$ -夸克碎裂特性

Measurement of $b$-quark fragmentation properties in jets using the decay $B^{\pm} \to J/ψK^{\pm}$ in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

利用2015 - 2018年期间在LHC的ATLAS探测器记录的$\sqrt{s} = 13$ TeV的$pp$碰撞的139 fb $^{-1}$中的带电$B$介子,研究了包含$b$ -强子的喷流的碎裂性质。$B$介子是利用$B^{\pm}$衰变为$J/ψK^{\pm}$,而$J/ψ$衰变为一对μ子来重建的。使用具有半径参数$R=0.4$的反$k_t$算法重建射流。测量确定的纵向和横向动量剖面重建$B$强子相对于它们的几何关联的射流的轴。这些分布测量的射流横向动量的间隔,范围从50 GeV到100 GeV以上。的结果进行了校正检测器的影响,并与几个Monte Carlo预测使用不同的部分子簇射和强子化模型进行了比较。纵向和横向的配置文件的结果提供了有用的输入,以改善描述的重味碎片射流。

英文摘要:

The fragmentation properties of jets containing $b$-hadrons are studied using charged $B$ mesons in 139 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV, recorded with the ATLAS detector at the LHC during the period from 2015 to 2018. The $B$ mesons are reconstructed using the decay of $B^{\pm}$ into $J/ψK^{\pm}$, with the $J/ψ$ decaying into a pair of muons. Jets are reconstructed using the anti-$k_t$ algorithm with radius parameter $R=0.4$. The measurement determines the longitudinal and transverse momentum profiles of the reconstructed $B$ hadrons with respect to the axes of the jets to which they are geometrically associated. These distributions are measured in intervals of the jet transverse momentum, ranging from 50 GeV to above 100 GeV. The results are corrected for detector effects and compared with several Monte Carlo predictions using different parton shower and hadronisation models. The results for the longitudinal and transverse profiles provide useful inputs to improve the description of heavy-flavour fragmentation in jets.

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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