Measurements of production cross sections of WZ and same-sign WW boson pairs in association with two jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The CMS collaboration
2020.

Abstract (data abstract)
Measurements of production cross sections of WZ and same-sign $W^\pm W^\pm$ boson pairs in association with two jets in proton-proton collisions at $\sqrt{s}$=13TeV at the LHC are reported. The data sample corresponds to an integrated luminosity of 137$fb^{-1}$, collected with the CMS detector during 2016--2018. The measurements are performed in the leptonic decay modes $W^\pm Z \to \ell^\pm\nu\ell'^\pm\ell'^\mp$ and $W^\pm W^\pm \to \ell^\pm\nu\ell'^\pm\nu$, where $\ell, \ell' = e$, $\mu$. Differential fiducial cross sections as functions of the invariant masses of the jet and charged lepton pairs, as well as of the leading-lepton transverse momentum, are measured for WW production and are consistent with the standard model predictions. The dependence of differential cross sections on the invariant mass of the jet pair is also measured for WZ production. An observation of electroweak production of WZ boson pairs is reported with an observed (expected) significance of 6.8 (5.3) standard deviations. Constraints are obtained on the structure of quartic vector boson interactions in the framework of effective field theory.

  • Table 2

    Data from Table 2

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    Relative systematic uncertainties in the EW $W^\pm W^\pm$ and WZ cross section measurements in units of percent.

  • Table 4a

    Data from Table 4a

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    Expected and observed yields from the standard model processeses in the WW signal region. The combination of the statistical and...

  • Table 4b

    Data from Table 4b

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    Expected and observed yields from the standard model processeses in the WZ signal region. The combination of the statistical and...

  • Table 5

    Data from Table 5

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    The measured inclusive fiducial cross section measurements. The WW fiducial region is defined by requiring two same-sign leptons with $p_{T}>20$,...

  • Figure 3a

    Data from Figure 3a

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    Distributions of $m_{jj}$ in the WW signal region.

  • Figure 3b

    Data from Figure 3b

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    Distributions of $m_{ll}$ in the WW signal region.

  • Figure 3c

    Data from Figure 3c

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    Distributions of $m_{jj}$ in the WZ signal region.

  • Figure 3d

    Data from Figure 3d

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    Distributions of BDT score in the WZ signal region.

  • Figure 4a

    Data from Figure 4a

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    Absolute WW cross section in $m_{jj}$ bins.

  • Figure 4b

    Data from Figure 4b

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    Normalized WW cross section in $m_{jj}$ bins.

  • Figure 4c

    Data from Figure 4c

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    Absolute WW cross section in $m_{ll}$ bins.

  • Figure 4d

    Data from Figure 4d

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    Normalized WW cross section in $m_{ll}$ bins.

  • Figure 4e

    Data from Figure 4e

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    Absolute WW cross section in $p_{T}^{l max}$ bins.

  • Figure 4f

    Data from Figure 4f

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    Normalized WW cross section in $p_{T}^{l max}$ bins.

  • Figure 5a

    Data from Figure 5a

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    Absolute WZ cross section in $m_{jj}$ bins.

  • Figure 5b

    Data from Figure 5b

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    Normalized WZ cross section in $m_{jj}$ bins.

  • Figure 6a

    Data from Figure 6a

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    Distributions of $m_{T}^{WW}$ in the WW signal region.

  • Figure 6b

    Data from Figure 6b

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    Distributions of $m_{T}^{WZ}$ in the WZ signal region.

  • Table 6

    Data from Table 6

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    Observed and expected lower and upper 95\% confidence level limits in TeV$^{-4}$ on the parameters of the quartic, obtained without...

  • Table 7

    Data from Table 7

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    Observed and expected lower and upper 95\% confidence level limits in TeV$^{-4}$ on the parameters of the quartic by cutting...

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