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Comparison of the Z/$\gamma$$^{∗}$ + jets to $\gamma$ + jets cross sections in pp collisions at $ \sqrt{s}=8 $ TeV

The CMS collaboration
JHEP 1510 (2015) 128, 2015

Abstract (data abstract)
CERN-LHC. A comparison of the differential cross sections for the processes $Z/\gamma^{*}+\text{jets}$ and photon $(\gamma)+\text{jets}$ is presented. The measurements are based on data collected with the CMS detector at $\sqrt{s}=8$\TeV corresponding to an integrated luminosity of 19.7\fbinv. The differential cross sections and their ratios are presented as functions of \pt. The measurements are also shown as functions of the jet multiplicity. Differential cross sections are obtained as functions of the ratio of the $Z/\gamma^{*}$ \pt to the sum of all jet transverse momenta and of the ratio of the $Z/\gamma^{*}$ \pt to the leading jet transverse momentum. The data are corrected for detector effects and are compared to simulations based on several QCD calculations. 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 and $p_{T}^{\ell\ell} > 100$ 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 $\Delta R < 0.5$ with respect to the axes of each lepton - for the ratio plots a cut on Z rapidity |y|<1.4 is also applied For $\gamma$ plus jets events we select: - at least a prompt photon with $p_{T} > 100$ GeV and $|\eta| < 1.4$ (in case there is more than one photon the leading one satisfying all cuts is used) - the photon must be isolated, i.e. the scalar sum of the $p_T$ of all stable particle in a cone of radius $\Delta R = 0.4$ is less then 5 GeV - at least one jet, jet selection $p_{T} > 30$ GeV and $|\eta| < 2.4$ , we remove jets within a radius of $\Delta R < 0.5$ with respect to the axis of the photon.

  • Table 1

    Data from Figure 2-a

    10.17182/hepdata.72989.v1/t1

    The Z boson differential transverse momentum cross-section in an inclusive $Z/\gamma^{*}+\mathrm{jets}$, $N_{\mathrm{jets}} \geq1$ selection.

  • Table 2

    Data from Figure 2-b

    10.17182/hepdata.72989.v1/t2

    The $\gamma$ differential transverse momentum cross-section in an inclusive $\gamma+\mathrm{jets}$, $N_{\mathrm{jets}} \geq1$ selection for central rapidities $\vert y_{\gamma} \vert >...

  • Table 3

    Data from Figure 3-a

    10.17182/hepdata.72989.v1/t3

    The Z boson differential transverse momentum cross-section in an inclusive $Z/\gamma^{*}+\mathrm{jets}$, $N_{\mathrm{jets}} \geq2$ selection.

  • Table 4

    Data from Figure 3-b

    10.17182/hepdata.72989.v1/t4

    The $\gamma$ differential transverse momentum cross-section in an inclusive $\gamma+\mathrm{jets}$, $N_{\mathrm{jets}} \geq2$ selection for central rapidities $\vert y_{\gamma} \vert >...

  • Table 5

    Data from Figure 4-a

    10.17182/hepdata.72989.v1/t5

    The Z boson differential transverse momentum cross-section in an inclusive $Z/\gamma^{*}+\mathrm{jets}$, $N_{\mathrm{jets}} \geq2$ over $Z/\gamma^{*}+\mathrm{jets}$, $N_{\mathrm{jets}} \geq1$ selection.

  • Table 6

    Data from Figure 4-b

    10.17182/hepdata.72989.v1/t6

    The $\gamma$ boson differential transverse momentum cross-section in an inclusive $\gamma+\mathrm{jets}$, $N_{\mathrm{jets}} \geq2$ over $Z+\mathrm{jets}$, $N_{\mathrm{jets}} \geq1$ selection for central...

  • Table 7

    Data from Figure 5-a

    10.17182/hepdata.72989.v1/t7

    The Z boson differential transverse momentum over $H_{\mathrm{T}}$ cross-section in an inclusive $Z/\gamma^{*}+\mathrm{jets}$, $N_{\mathrm{jets}} \geq2$ selection.

  • Table 8

    Data from Figure 5-b

    10.17182/hepdata.72989.v1/t8

    The Z boson differential transverse momentum over $H_{\mathrm{T}}$ cross-section in an inclusive $Z/\gamma^{*}+\mathrm{jets}$, $N_{\mathrm{jets}} \geq3$ selection.

  • Table 9

    Data from Figure 6-a

    10.17182/hepdata.72989.v1/t9

    The log (base 10) of the Z boson differential transverse momentum over the leading jet transverse momentum cross-section in an...

  • Table 10

    Data from Figure 6-b

    10.17182/hepdata.72989.v1/t10

    The log (base 10) of the Z boson differential transverse momentum over the leading jet transverse momentum cross-section in an...

  • Table 11

    Data from Figure 7-a

    10.17182/hepdata.72989.v1/t11

    Differential cross-section ratio of Z over $\gamma$ as a function of the total transverse momentum cross-section and for central bosons...

  • Table 12

    Data from Figure 7-b

    10.17182/hepdata.72989.v1/t12

    Differential cross-section ratio of Z over $\gamma$ as a function of the total transverse momentum cross-section and for central bosons...

  • Table 13

    Data from Figure 8-a

    10.17182/hepdata.72989.v1/t13

    Differential cross-section ratio of Z over $\gamma$ as a function of the total transverse momentum cross-section and for central bosons...

  • Table 14

    Data from Figure 8-b

    10.17182/hepdata.72989.v1/t14

    Differential cross-section ratio of Z over $\gamma$ as a function of the total transverse momentum cross-section and for central bosons...

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