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

The CMS collaboration
Phys.Rev.D 102 (2020) 032007, 2020.

Abstract (data abstract)
Ratios of cross sections, $\sigma(Z+\text{c jets})/\sigma(Z+\text{jets})$, $\sigma(Z+\text{b jets})/\sigma(Z+\text{jets})$, and $\sigma(Z+\text{c jets})/\sigma(Z+\text{b jets})$ 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 $p_T>30$ GeV and $|\eta|<2.4$ for the jets, where $p_T$ and $\eta$ represent transverse momentum and pseudorapidity, respectively. The Z boson candidates come from leptonic decays into electrons or muons with $p_T>25$ GeV and $|\eta|<2.4$, and the dilepton mass satisfies $71<m_{Z}<111$ GeV. The measured values are $\sigma(Z+\text{c jets})/\sigma(Z+\text{jets}) = 0.102 \pm 0.002 \pm 0.009$, $\sigma(Z+\text{b jets})/\sigma(Z+\text{jets}) = 0.0633 \pm 0.0004 \pm 0.0015$, and $\sigma(Z+\text{c jets})/\sigma(Z+\text{b jets}) = 1.62 \pm 0.03 \pm 0.15$. 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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