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Event shapes and azimuthal correlations in $Z$ + jets events in $pp$ collisions at $\sqrt{s}=7$ TeV

The CMS collaboration
Phys.Lett. B722 (2013) 238-261, 2013

Abstract (data abstract)
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 $p_{T} > 20$ GeV and $|\eta| < 2.4$ and $71 < M_{\ell\ell} < 111 $ GeV - leptons are "dressed" with all photons in a cone of radius $\Delta R = 0.1$ - at least one jet, jet selection $p_{T} > 30$ GeV and $|\eta| < 2.4$, we remove jets within a radius of $\Delta R < 0.4$ with respect to the axes of each lepton - for the ratio plots a cut on Z rapidity |y|<1.4 is also applied The event shape variable is defined as $\tau_{\perp}\equiv 1-\max_{\vec{n}_{T}}\frac{\sum_{i}\left|\vec{p}_{\perp,i}\cdot \vec{n}_{T} \right|}{\sum_{i}p_{\perp,i}}$.

  • Table 1

    Data from Figure 4a

    10.17182/hepdata.75374.v1/t1

    Normalized DPhi(Z, j1) distributions for Njets >= 1.

  • Table 2

    Data from Figure 4a

    10.17182/hepdata.75374.v1/t2

    Normalized DPhi(Z, j1) distributions for Njets >= 2.

  • Table 3

    Data from Figure 4a

    10.17182/hepdata.75374.v1/t3

    Normalized DPhi(Z, j1) distributions for Njets >= 3.

  • Table 4

    Data from Figure 5a

    10.17182/hepdata.75374.v1/t4

    Normalized DPhi(Z, j2) distributions for Njets >= 3.

  • Table 5

    Data from Figure 5a

    10.17182/hepdata.75374.v1/t5

    Normalized DPhi(Z, j3) distributions for Njets >= 3.

  • Table 6

    Data from Figure 6a

    10.17182/hepdata.75374.v1/t6

    Normalized DPhi(j1, j2) distributions for Njets >= 3.

  • Table 7

    Data from Figure 6a

    10.17182/hepdata.75374.v1/t7

    Normalized DPhi(j1, j3) distributions for Njets >= 3.

  • Table 8

    Data from Figure 6a

    10.17182/hepdata.75374.v1/t8

    Normalized DPhi(j2, j3) distributions for Njets >= 3.

  • Table 9

    Data from Figure 4b

    10.17182/hepdata.75374.v1/t9

    Normalized DPhi(Z, j1) distributions for Njets >= 1 and PT(Z) >= 150 GeV.

  • Table 10

    Data from Figure 4b

    10.17182/hepdata.75374.v1/t10

    Normalized DPhi(Z, j1) distributions for Njets >= 2 and PT(Z) >= 150 GeV.

  • Table 11

    Data from Figure 4b

    10.17182/hepdata.75374.v1/t11

    Normalized DPhi(Z, j1) distributions for Njets >= 3 and PT(Z) >= 150 GeV.

  • Table 12

    Data from Figure 5b

    10.17182/hepdata.75374.v1/t12

    Normalized DPhi(Z, j2) distributions for Njets >= 3 and PT(Z) >= 150 GeV.

  • Table 13

    Data from Figure 5b

    10.17182/hepdata.75374.v1/t13

    Normalized DPhi(Z, j3) distributions for Njets >= 3 and PT(Z) >= 150 GeV.

  • Table 14

    Data from Figure 6b

    10.17182/hepdata.75374.v1/t14

    Normalized DPhi(j1, j2) distributions for Njets >= 3 and PT(Z) >= 150 GeV.

  • Table 15

    Data from Figure 6b

    10.17182/hepdata.75374.v1/t15

    Normalized DPhi(j1, j3) distributions for Njets >= 3 and PT(Z) >= 150 GeV.

  • Table 16

    Data from Figure 6b

    10.17182/hepdata.75374.v1/t16

    Normalized DPhi(j2, j3) distributions for Njets >= 3 and PT(Z) >= 150 GeV.

  • Table 17

    Data from Figure 7a

    10.17182/hepdata.75374.v1/t17

    Normalized distributions in ln(tauT) for all PT(Z) and Njets >=1.

  • Table 18

    Data from Figure 7b

    10.17182/hepdata.75374.v1/t18

    Normalized distributions in ln(tauT) for PT(Z) > 150 GeV and Njets >=1.

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