W$^+$W$^-$ boson pair production in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
Phys. Rev. D and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP_18-004 (CMS Public Pages), 2020.

Abstract (data abstract)
A measurement of the W W boson pair production cross section in proton-proton collisions at $\sqrt{s}$ = 13 TeV is presented. The data used in this study were collected with the CMS detector at the LHC and correspond to an integrated luminosity of 35.9 fb$^{−1}$. The W$^+$ W$^−$ candidate events are selected by first requiring two oppositely-charged leptons (electrons or muons). Two methods for reducing background contributions are employed. In the first one, a sequence of requirements on kinematic quantities is applied allowing a measurement of the total cross section: 117.6 ± 6.8 pb which agrees well with the theoretical cross section. Fiducial cross sections are also reported for events with zero jets or one jet, and the change in the zero-jet fiducial cross sec- tion with the jet $p_T$ threshold is measured. Normalized differential cross sections are reported within the fiducial region; these are compared to theoretical predictions based on quantum chromodynamics at next-to-next-to-leading-order accuracy. A second method for suppressing background contributions employs two random forest classifiers. The analysis based on this method includes a measurement of the total cross section and also a measurement of the normalized jet multiplicity distribution in $W$^+ W$^−$ events. Finally, a dilepton invariant mass distribution is used to probe for physics beyond the standard model in the context of an effective field theory and limits on the presence of dimension-6 operators are derived.

  • Table 5

    Data from Table 5

    10.17182/hepdata.94259.v1/t1

    Summary of cross sections obtained in the sequential cut analysis. The uncertainty listed is the total uncertainty obtained from the...

  • Table 8

    Data from Table 8

    10.17182/hepdata.94259.v1/t2

    Measured fraction of events after unfolding for $N_J = 0, 1, \geq 2$ jets. The first uncertainty is statistical and...

  • Table 9

    Data from Table 9

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    Expected and observed 68% and 95% confidence intervals on the measurement of the Wilson coefficients associated with the three CP-preserving,...

  • Figure 6 top left

    Data from Figure 6

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    Measured normalized differential cross sections with respect to the dilepton invariant mass.

  • Figure 6 top right

    Data from Figure 6

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    Measured normalized differential cross sections with respect to the leading lepton $p_T$.

  • Figure 6 bottom left

    Data from Figure 6

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    Measured normalized differential cross sections with respect to the trailing lepton $p_T$.

  • Figure 6 bottom right

    Data from Figure 6

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    Measured normalized differential cross sections with respect to the dilepton azimuthal angular separation.

  • Table 6

    Data from Table 6

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    Fiducial cross section for the production of $W^+W^−$ +0-jets as the $p_T$ threshold for jets is varied. The fiducial region...

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