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.

Table 1

Table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

Table 9

Table 10

Table 11

Table 12

Table 13

Table 14

Table 15

Table 16

Table 17

Table 18

JSON

YAML

YODA

ROOT

CSV

Visualize

Ask a Question