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arXiv 2001.06899hep-ex
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在$\sqrt{s} =$ 13 TeV质子-质子碰撞中与粲喷流或底夸克喷流相关产生Z玻色子的测量

Measurement of the associated production of a Z boson with charm or bottom quark jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

备注：
Replaced with the published version. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-19-004 (CMS Public Pages)
发表信息：
Phys. Rev. D 102, 032007 (2020)
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摘要：

在$\sqrt{s} =$ 13 TeV的质子-质子碰撞中，测量了Z玻色子与至少一个粲喷注或底夸克喷注相关联产生的截面比$σ$（Z + c喷注）/$σ$（Z+喷注）、$σ$（Z + b喷注）/$σ$（Z+喷注）和$σ$（Z+c喷注）/ $σ$（Z+b喷注）.由CMS实验在CERN LHC收集的数据样本对应于35.9 fb $^{-1}$的积分光度，喷流的基准体积为$p_\mathrm{T}$ $>$ 30 GeV和$|η|$ $<$ 2.4，其中$p_\mathrm{T}$和$η$分别代表横向动量和伪快度。Z玻色子候选者来自于$p_\mathrm{T}$ $>$ 25 GeV和$|η|$ $<$ 2.4的轻子衰变成电子或μ子，双轻子质量满足71 $\lt$ $m_\mathrm{Z}$ $\lt$ 111 GeV。测量值为$σ$（Z+c喷射）/ $σ$（Z+喷射）= 0.102 $\pm$ 0.002 $\pm$ 0.009，$σ$（Z+b喷射）/ $σ$（Z+喷射）= 0.0633 $\pm$ 0.0004 $\pm$ 0.0015，以及$σ$（Z+c喷射）/ $σ$（Z+b喷射）= 1.62 $\pm$ 0.03 $\pm$ 0.15。包容性和微分截面比作为射流和Z玻色子横向动量的函数的结果进行了比较，从领先和次领先阶微扰量子色动力学计算的预测。这是在13 TeV的截面比的第一次测量。

英文摘要：

Ratios of cross sections, $σ$(Z+c jets) / $σ$(Z+jets), $σ$(Z+b jets) / $σ$(Z+jets), and $σ$(Z+c jets) / $σ$(Z+b jets) in the associated production of a Z boson with at least one charm or bottom quark jet are measured in proton-proton collisions at $\sqrt{s} =$ 13 TeV. The data sample, collected by the CMS experiment at the CERN LHC, corresponds to an integrated luminosity of 35.9 fb$^{-1}$, with a fiducial volume of $p_\mathrm{T}$ $>$ 30 GeV and $|η|$ $<$ 2.4 for the jets, where $p_\mathrm{T}$ and $η$ represent transverse momentum and pseudorapidity, respectively. The Z boson candidates come from leptonic decays into electrons or muons with $p_\mathrm{T}$ $>$ 25 GeV and $|η|$ $<$ 2.4, and the dilepton mass satisfies 71 $\lt$ $m_\mathrm{Z}$ $\lt$ 111 GeV. The measured values are $σ$(Z+c jets) / $σ$(Z+jets) = 0.102 $\pm$ 0.002 $\pm$ 0.009, $σ$(Z+b jets) / $σ$(Z+jets) = 0.0633 $\pm$ 0.0004 $\pm$ 0.0015, and $σ$(Z+c jets) / $σ$(Z+b jets) = 1.62 $\pm$ 0.03 $\pm$ 0.15. Results on the inclusive and differential cross section ratios as functions of jet and Z boson transverse momentum are compared with predictions from leading and next-to-leading order perturbative quantum chromodynamics calculations. These are the first measurements of the cross section ratios at 13 TeV.

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