cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17182/hepdata.75368.v1/t2
title: "Table 2" of "Measurement of the ZZ production cross section and Z to l+l-l'+l'- branching fraction in pp collisions at sqrt(s) = 13 TeV"

description: The (P P to Z to l+l-l'+l'-) fiducial cross section. The first systematic uncertainty is detector systematics, the second is luminosity uncertainty. The theoretical prediction is POWHEG generated at NLO using NNPDF3.0 PDFs and scales mu_F = mu_R = m[l+l-l'+l'-].
description: CERN-LHC. Four-lepton production in proton-proton collisions, pp to (Z/gamma*)(Z/gamma*) to l+l-l'+l'-, where l, l' = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.6 inverse femtobarns. The ZZ production cross section, sigma(pp to ZZ) = 14.6 +1.9/-1.8 (stat) +0.5/-0.3 (syst) +/- 0.2 (theo) +/- 0.4 (lumi) pb, is measured for events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 &lt; m[l+l-], m[l'+l'-] &lt; 120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z to l+l-l'+l'-) = 4.9 +0.8/-0.7 (stat) +0.3/-0.2 (syst) +0.2/-0.1 (theo) +/- 0.1 (lumi) x E-6 for the four-lepton invariant mass in the range 80 &lt; m[l+l-l'+l'-] &lt; 100 GeV and dilepton mass m[l+l-] &gt; 4 GeV for all opposite-sign, same-flavor lepton pairs.

The phase spaces for all fiducial cross section measurements include the following requirements:
- 4e, 4mu, or 2e2mu (opposite-sign, same-flavor pairs)
- All opposite-sign same-flavor lepton pairs m[l+l-] &gt; 4 GeV
- All leptons |eta| &lt; 2.5
- Leading lepton pt &gt; 20 GeV
- Second lepton pt &gt; 10 GeV
- All lepton pt &gt; 5 GeV

The ZZ to lll'l' fiducial cross section phase space further requires the following:
- Both dileptons in 60 &lt; m[l+l-] &lt; 120 GeV

The Z to lll'l' fiducial cross section and branching ratio measurements further require the following:
- mZ1 &gt; 40 GeV where Z1 is the lepton pair with invariant mass closest to the nominal Z mass
- 80 &lt; m[l+l-l'+l'-] &lt; 100 GeV

The phase space for the total ZZ cross section measurement is defined as:
- Both Z bosons are required to have invariant mass between 60 and 120 GeV.
DOI: 10.17182/hepdata.75368.v1/t3
title: "Table 3" of "Measurement of the ZZ production cross section and Z to l+l-l'+l'- branching fraction in pp collisions at sqrt(s) = 13 TeV"

description: The total (P P to Z) cross section times the (Z to l+l-l'+l'-) branching ratio. The first systematic uncertainty is detector systematics, the second is theoretical uncertainty, and the third is luminosity uncertainty.
description: CERN-LHC. Four-lepton production in proton-proton collisions, pp to (Z/gamma*)(Z/gamma*) to l+l-l'+l'-, where l, l' = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.6 inverse femtobarns. The ZZ production cross section, sigma(pp to ZZ) = 14.6 +1.9/-1.8 (stat) +0.5/-0.3 (syst) +/- 0.2 (theo) +/- 0.4 (lumi) pb, is measured for events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 &lt; m[l+l-], m[l'+l'-] &lt; 120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z to l+l-l'+l'-) = 4.9 +0.8/-0.7 (stat) +0.3/-0.2 (syst) +0.2/-0.1 (theo) +/- 0.1 (lumi) x E-6 for the four-lepton invariant mass in the range 80 &lt; m[l+l-l'+l'-] &lt; 100 GeV and dilepton mass m[l+l-] &gt; 4 GeV for all opposite-sign, same-flavor lepton pairs.

The phase spaces for all fiducial cross section measurements include the following requirements:
- 4e, 4mu, or 2e2mu (opposite-sign, same-flavor pairs)
- All opposite-sign same-flavor lepton pairs m[l+l-] &gt; 4 GeV
- All leptons |eta| &lt; 2.5
- Leading lepton pt &gt; 20 GeV
- Second lepton pt &gt; 10 GeV
- All lepton pt &gt; 5 GeV

The ZZ to lll'l' fiducial cross section phase space further requires the following:
- Both dileptons in 60 &lt; m[l+l-] &lt; 120 GeV

The Z to lll'l' fiducial cross section and branching ratio measurements further require the following:
- mZ1 &gt; 40 GeV where Z1 is the lepton pair with invariant mass closest to the nominal Z mass
- 80 &lt; m[l+l-l'+l'-] &lt; 100 GeV

The phase space for the total ZZ cross section measurement is defined as:
- Both Z bosons are required to have invariant mass between 60 and 120 GeV.
DOI: 10.17182/hepdata.75368.v1/t4
title: "Table 4" of "Measurement of the ZZ production cross section and Z to l+l-l'+l'- branching fraction in pp collisions at sqrt(s) = 13 TeV"

description: The (Z to l+l-l'+l'-) branching ratio. The first systematic uncertainty is detector systematics, the second is theoretical uncertainty, and the third is luminosity uncertainty. The theoretical prediction is from MadGraph5_aMC@NLO.
description: CERN-LHC. Four-lepton production in proton-proton collisions, pp to (Z/gamma*)(Z/gamma*) to l+l-l'+l'-, where l, l' = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.6 inverse femtobarns. The ZZ production cross section, sigma(pp to ZZ) = 14.6 +1.9/-1.8 (stat) +0.5/-0.3 (syst) +/- 0.2 (theo) +/- 0.4 (lumi) pb, is measured for events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 &lt; m[l+l-], m[l'+l'-] &lt; 120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z to l+l-l'+l'-) = 4.9 +0.8/-0.7 (stat) +0.3/-0.2 (syst) +0.2/-0.1 (theo) +/- 0.1 (lumi) x E-6 for the four-lepton invariant mass in the range 80 &lt; m[l+l-l'+l'-] &lt; 100 GeV and dilepton mass m[l+l-] &gt; 4 GeV for all opposite-sign, same-flavor lepton pairs.

The phase spaces for all fiducial cross section measurements include the following requirements:
- 4e, 4mu, or 2e2mu (opposite-sign, same-flavor pairs)
- All opposite-sign same-flavor lepton pairs m[l+l-] &gt; 4 GeV
- All leptons |eta| &lt; 2.5
- Leading lepton pt &gt; 20 GeV
- Second lepton pt &gt; 10 GeV
- All lepton pt &gt; 5 GeV

The ZZ to lll'l' fiducial cross section phase space further requires the following:
- Both dileptons in 60 &lt; m[l+l-] &lt; 120 GeV

The Z to lll'l' fiducial cross section and branching ratio measurements further require the following:
- mZ1 &gt; 40 GeV where Z1 is the lepton pair with invariant mass closest to the nominal Z mass
- 80 &lt; m[l+l-l'+l'-] &lt; 100 GeV

The phase space for the total ZZ cross section measurement is defined as:
- Both Z bosons are required to have invariant mass between 60 and 120 GeV.
DOI: 10.17182/hepdata.75368.v1/t5
title: "Table 5" of "Measurement of the ZZ production cross section and Z to l+l-l'+l'- branching fraction in pp collisions at sqrt(s) = 13 TeV"

description: The total (P P to Z Z) cross section. The first systematic uncertainty is detector systematics, the second is theoretical uncertainty, and the third is luminosity uncertainty. The theoretical predictions are MATRIX generated at NNLO and POWHEG generated at NLO plus the gluon-gluon initial state contribution from MCFM. Both use NNPDF3.0 PDFs and fixed scales mu_F = mu_R = 0.5m[l+l-l'+l'-].
description: CERN-LHC. Four-lepton production in proton-proton collisions, pp to (Z/gamma*)(Z/gamma*) to l+l-l'+l'-, where l, l' = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.6 inverse femtobarns. The ZZ production cross section, sigma(pp to ZZ) = 14.6 +1.9/-1.8 (stat) +0.5/-0.3 (syst) +/- 0.2 (theo) +/- 0.4 (lumi) pb, is measured for events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 &lt; m[l+l-], m[l'+l'-] &lt; 120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z to l+l-l'+l'-) = 4.9 +0.8/-0.7 (stat) +0.3/-0.2 (syst) +0.2/-0.1 (theo) +/- 0.1 (lumi) x E-6 for the four-lepton invariant mass in the range 80 &lt; m[l+l-l'+l'-] &lt; 100 GeV and dilepton mass m[l+l-] &gt; 4 GeV for all opposite-sign, same-flavor lepton pairs.

The phase spaces for all fiducial cross section measurements include the following requirements:
- 4e, 4mu, or 2e2mu (opposite-sign, same-flavor pairs)
- All opposite-sign same-flavor lepton pairs m[l+l-] &gt; 4 GeV
- All leptons |eta| &lt; 2.5
- Leading lepton pt &gt; 20 GeV
- Second lepton pt &gt; 10 GeV
- All lepton pt &gt; 5 GeV

The ZZ to lll'l' fiducial cross section phase space further requires the following:
- Both dileptons in 60 &lt; m[l+l-] &lt; 120 GeV

The Z to lll'l' fiducial cross section and branching ratio measurements further require the following:
- mZ1 &gt; 40 GeV where Z1 is the lepton pair with invariant mass closest to the nominal Z mass
- 80 &lt; m[l+l-l'+l'-] &lt; 100 GeV

The phase space for the total ZZ cross section measurement is defined as:
- Both Z bosons are required to have invariant mass between 60 and 120 GeV.
DOI: 10.17182/hepdata.75374.v1/t1
title: "Table 1" of "Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV"

description: Normalized DPhi(Z, j1) distributions for Njets &gt;= 1.
description: CERN-LHC. Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models

For $Z/\gamma^{*}$ plus jets events we select:
- two same flavour opposite sign leptons with $p_{T} &gt; 20$ GeV and $|\eta| &lt; 2.4$ and $71 &lt; M_{\ell\ell} &lt; 111 $ GeV 
- leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$
- at least one jet, jet selection $p_{T} &gt; 30$ GeV and $|\eta| &lt; 2.4$, we remove jets within a radius of $\Delta R &lt; 0.4$ with respect to the axes of each lepton
- for the ratio plots a cut on Z rapidity |y|&lt;1.4 is also applied

The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.
DOI: 10.17182/hepdata.75374.v1/t2
title: "Table 2" of "Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV"

description: Normalized DPhi(Z, j1) distributions for Njets &gt;= 2.
description: CERN-LHC. Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models

For $Z/\gamma^{*}$ plus jets events we select:
- two same flavour opposite sign leptons with $p_{T} &gt; 20$ GeV and $|\eta| &lt; 2.4$ and $71 &lt; M_{\ell\ell} &lt; 111 $ GeV 
- leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$
- at least one jet, jet selection $p_{T} &gt; 30$ GeV and $|\eta| &lt; 2.4$, we remove jets within a radius of $\Delta R &lt; 0.4$ with respect to the axes of each lepton
- for the ratio plots a cut on Z rapidity |y|&lt;1.4 is also applied

The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.
DOI: 10.17182/hepdata.75374.v1/t3
title: "Table 3" of "Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV"

description: Normalized DPhi(Z, j1) distributions for Njets &gt;= 3.
description: CERN-LHC. Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models

For $Z/\gamma^{*}$ plus jets events we select:
- two same flavour opposite sign leptons with $p_{T} &gt; 20$ GeV and $|\eta| &lt; 2.4$ and $71 &lt; M_{\ell\ell} &lt; 111 $ GeV 
- leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$
- at least one jet, jet selection $p_{T} &gt; 30$ GeV and $|\eta| &lt; 2.4$, we remove jets within a radius of $\Delta R &lt; 0.4$ with respect to the axes of each lepton
- for the ratio plots a cut on Z rapidity |y|&lt;1.4 is also applied

The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.
DOI: 10.17182/hepdata.75374.v1/t4
title: "Table 4" of "Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV"

description: Normalized DPhi(Z, j2) distributions for Njets &gt;= 3.
description: CERN-LHC. Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models

For $Z/\gamma^{*}$ plus jets events we select:
- two same flavour opposite sign leptons with $p_{T} &gt; 20$ GeV and $|\eta| &lt; 2.4$ and $71 &lt; M_{\ell\ell} &lt; 111 $ GeV 
- leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$
- at least one jet, jet selection $p_{T} &gt; 30$ GeV and $|\eta| &lt; 2.4$, we remove jets within a radius of $\Delta R &lt; 0.4$ with respect to the axes of each lepton
- for the ratio plots a cut on Z rapidity |y|&lt;1.4 is also applied

The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.
DOI: 10.17182/hepdata.75374.v1/t5
title: "Table 5" of "Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV"

description: Normalized DPhi(Z, j3) distributions for Njets &gt;= 3.
description: CERN-LHC. Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models

For $Z/\gamma^{*}$ plus jets events we select:
- two same flavour opposite sign leptons with $p_{T} &gt; 20$ GeV and $|\eta| &lt; 2.4$ and $71 &lt; M_{\ell\ell} &lt; 111 $ GeV 
- leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$
- at least one jet, jet selection $p_{T} &gt; 30$ GeV and $|\eta| &lt; 2.4$, we remove jets within a radius of $\Delta R &lt; 0.4$ with respect to the axes of each lepton
- for the ratio plots a cut on Z rapidity |y|&lt;1.4 is also applied

The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.
DOI: 10.17182/hepdata.75374.v1/t6
title: "Table 6" of "Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV"

description: Normalized DPhi(j1, j2) distributions for Njets &gt;= 3.
description: CERN-LHC. Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models

For $Z/\gamma^{*}$ plus jets events we select:
- two same flavour opposite sign leptons with $p_{T} &gt; 20$ GeV and $|\eta| &lt; 2.4$ and $71 &lt; M_{\ell\ell} &lt; 111 $ GeV 
- leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$
- at least one jet, jet selection $p_{T} &gt; 30$ GeV and $|\eta| &lt; 2.4$, we remove jets within a radius of $\Delta R &lt; 0.4$ with respect to the axes of each lepton
- for the ratio plots a cut on Z rapidity |y|&lt;1.4 is also applied

The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.
DOI: 10.17182/hepdata.75374.v1/t7
title: "Table 7" of "Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV"

description: Normalized DPhi(j1, j3) distributions for Njets &gt;= 3.
description: CERN-LHC. Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models

For $Z/\gamma^{*}$ plus jets events we select:
- two same flavour opposite sign leptons with $p_{T} &gt; 20$ GeV and $|\eta| &lt; 2.4$ and $71 &lt; M_{\ell\ell} &lt; 111 $ GeV 
- leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$
- at least one jet, jet selection $p_{T} &gt; 30$ GeV and $|\eta| &lt; 2.4$, we remove jets within a radius of $\Delta R &lt; 0.4$ with respect to the axes of each lepton
- for the ratio plots a cut on Z rapidity |y|&lt;1.4 is also applied

The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.
DOI: 10.17182/hepdata.75374.v1/t10
title: "Table 10" of "Event shapes and azimuthal correlations in Z + jets events in pp collisions at sqrt(s) =7 TeV"

description: Normalized DPhi(Z, j1) distributions for Njets &gt;= 2 and PT(Z) &gt;= 150 GeV.
description: CERN-LHC. Measurements of event shapes and azimuthal correlations are presented for events where a Z boson is produced in association with jets in proton-proton collisions. The data collected with the CMS detector at the CERN LHC at sqrt(s) = 7 TeV correspond to an integrated luminosity of 5.0 inverse femtobarns. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z + 1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD models

For $Z/\gamma^{*}$ plus jets events we select:
- two same flavour opposite sign leptons with $p_{T} &gt; 20$ GeV and $|\eta| &lt; 2.4$ and $71 &lt; M_{\ell\ell} &lt; 111 $ GeV 
- leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$
- at least one jet, jet selection $p_{T} &gt; 30$ GeV and $|\eta| &lt; 2.4$, we remove jets within a radius of $\Delta R &lt; 0.4$ with respect to the axes of each lepton
- for the ratio plots a cut on Z rapidity |y|&lt;1.4 is also applied

The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.