cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.85868.v1/t14
title: "Figure 5 a" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Distribution of the corrected secondary-vertex mass normalized to unity, in simulated W + c and Z + c samples, and in W + c data events.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t15
title: "Figure 5 b" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Distribution of the JP discriminant for the D± mode normalized to unity, in simulated W + c and Z + c samples, and in W + c data events.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t9
title: "Figure 2 b" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: The invariant mass distribution of three-prong secondary vertices for events selected in the D ± mode, in the dimuon channel
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t16
title: "Figure 5 c" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Distribution of the JP discriminant for the D∗(2010) ± mode normalized to unity, in simulated W + c and Z + c samples, and in W + c data events.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t17
title: "Figure 6" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Distribution of the corrected secondary-vertex mass normalized to unity from simulated Z + b and eμ-tt data events
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t18
title: "Figure 7 a" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Corrected secondary-vertex mass distributions, after background subtraction in the dielectron channel for events selected in the semileptonic mode.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t19
title: "Figure 7 b" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Corrected secondary-vertex mass distributions, after background subtraction in the dimuon channel for events selected in the semileptonic mode.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t20
title: "Figure 8 a" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Background-subtracted distributions of the JP discriminant in the dielectron channel for Z + jets events with a D± → K∓ π± π± candidate.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t21
title: "Figure 8 b" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Background-subtracted distributions of the JP discriminant in the dimuon channel for Z + jets events with a D± → K∓ π± π± candidate.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t22
title: "Figure 9 a" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Background-subtracted distributions of the JP discriminant in the dielectron channel for Z +jets events with a D∗(2010)± → D0 π± → K∓ π± π± candidate.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t23
title: "Figure 9 b" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Background-subtracted distributions of the JP discriminant in the dimuon channel for Z +jets events with a D∗(2010)± → D0 π± → K∓ π± π± candidate.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t24
title: "Figure 10" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: ontributions to the systematic uncertainty in the measured Z+c cross section and in the (Z+c)/(Z+b) cross section ratio.
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t25
title: "Figure 11 a" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: Differential Z + c cross section as a function of the transverse momentum of the Z boson
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.
DOI: 10.17182/hepdata.85868.v1/t26
title: "Figure 11 b" of "Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV"

description: (Z +c)/(Z +b) cross section ratio as a function of the transverse momentum of teh Z boson
description: A study of the associated production of a Z boson and a charm quark jet (Z+c), and a comparison to production with a b quark jet (Z+b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $p_T^l &gt; 20$ GeV, $|\eta_l| &lt; 2.1$, $71 &lt; m_{\ell\ell} &lt; 111$ GeV, and heavy flavour jets with $p_T^{\text{jet}} &gt; 25$ GeV and $|\eta_\text{jet}| &lt; 2.5$. The Z+c production cross section is measured to $\sigma(pp \to Z + c + X) \mathcal{B}(Z \to \ell^+\ell^-) = 8.8 \pm 0.5$ (stat) $\pm 0.6$ (syst) pb. The ratio of the Z+c and Z+b production cross sections is measured to be $\sigma(pp \to Z + c + X)/\sigma(pp \to Z + b + X) = 2.0 \pm 0.2$ (stat) $\pm 0.2$ (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions.