Abstract (data abstract)

Measurements at sqrt(s)= 13.6 TeV of the opposite-sign W boson pair production cross section in proton-proton collisions are presented. The data used in this study were collected with the CMS detector at the CERN LHC in 2022, and correspond to an integrated luminosity of 34.8 fb-1. Events are selected by requiring one electron and one muon of opposite charge. A maximum likelihood fit is performed on signal- and background-enriched data categories defined by the flavour and charge of the leptons, the number of jets, and number of jets originating from b quarks. The overall sensitivity is significantly better than previous results with a similar integrated luminosity. The improvement comes from a more refined control of experimental uncertainties and an improved fit strategy. An inclusive WW production cross section of 125.7 +/- 5.6 pb is measured, in agreement with standard model predictions. Cross sections are also reported in a fiducial region close to that of the detector acceptance, both inclusively and differentially, as a function of the jet multiplicity in the event. For the first time in proton-proton collisions, WW events with zero, one, and at least two jets are studied simultaneously and compared with recent theoretical predictions.

Main result

10.17182/hepdata.150773.v2/t1

Summary of inclusive cross section.
Table 3

Data from Table 3

10.17182/hepdata.150773.v2/t2

Relative systematic uncertainties in the total cross section measurement.
Figure 3

Data from Figure 3

10.17182/hepdata.150773.v2/t3

Measured fraction of events for $N_j = 0, 1, \geq 2$ jets. The total uncertainty is reported.
Additional Table 1

Data from Additional Table 1

10.17182/hepdata.150773.v2/t4

Correlation matrix from inclusive and normalized cross section measurements
Additional Table 3

Data from Additional Table 3

10.17182/hepdata.150773.v2/t5

Fiducial cross sections for $N_j = 0, 1, \geq 2$ jets. The total uncertainty is reported.
Additional Covariance Matrix Table

Data from Covariance Matrix Table

10.17182/hepdata.150773.v2/t6

Covariance Matrix from fiducial and normalized cross sections measurements (total, and one and two jet bin fractions).

Main result

Table 3

Figure 3

Additional Table 1

Additional Table 3

Additional Covariance Matrix Table

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