Measurement of inclusive and differential cross sections for single top quark production in association with a W boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-TOP-21-010, 2022.

Abstract
Measurements of the inclusive and normalised differential cross sections are presented for the production of single top quarks in association with a W boson in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data used were recorded with the CMS detector at the LHC during 2016-2018, and correspond to an integrated luminosity of 138 fb$^{-1}$. Events containing one electron and one muon in the final state are analysed. For the inclusive measurement, a multivariate discriminant, exploiting the kinematic properties of the events is used to separate the signal from the dominant $\mathrm{t\bar{t}}$ background. A cross section of 79.2 $\pm$ 0.9 (stat) $^{+7.7}_{-8.0}$ (syst) $\pm$ 1.2 (lumi) pb is obtained, consistent with the predictions of the standard model. For the differential measurements, a fiducial region is defined according to the detector acceptance, and the requirement of exactly one jet coming from the fragmentation of a bottom quark. The resulting distributions are unfolded to particle level and agree with the predictions at next-to-leading order in perturbative quantum chromodynamics.

  • Figure 6a

    Data from Figure 6 (top left), located on page 14.

    10.17182/hepdata.128942.v1/t1

    The distribution of the BDT discriminant for events in the 1j1b region. The data (points) and the MC predictions (coloured...

  • Figure 6b

    Data from Figure 6 (top right), located on page 14.

    10.17182/hepdata.128942.v1/t2

    The distribution of the BDT discriminant for events in the 2j1b region. The data (points) and the MC predictions (coloured...

  • Figure 6c

    Data from Figure 6 (bottom), located on page 14.

    10.17182/hepdata.128942.v1/t3

    The distribution of the Subleading jet $p_{T}$ for events in the 2j2b region. The data (points) and the MC predictions...

  • Cross section

    Data from page 13.

    10.17182/hepdata.128942.v1/t4

    Observed and theoretical cross sections. In the observed, the first uncertainty is statistical, the second is the systematic, and the...

  • Table 3

    Data from Table 3, located on page 14.

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    The number of observed and MC predicted events after the fit in the 1j1b, 2j1b, and 2j2b regions. The statistical...

  • Figure 8a

    Data from Figure 8 (top left), located on page 17.

    10.17182/hepdata.128942.v1/t6

    Normalised fiducial differential tW production cross section as a function of the $Leading$ $lepton$ $p_{T}$. The vertical bars on the...

  • Figure 8b

    Data from Figure 8 (top right), located on page 17.

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    Normalised fiducial differential tW production cross section as a function of the $p_{Z}(e^{\pm}, \mu^{\pm}, j)$. The vertical bars on the...

  • Figure 8c

    Data from Figure 8 (middle left), located on page 17.

    10.17182/hepdata.128942.v1/t8

    Normalised fiducial differential tW production cross section as a function of the $Jet$ $p_{T}$. The vertical bars on the points...

  • Figure 8d

    Data from Figure 8 (middle right), located on page 17.

    10.17182/hepdata.128942.v1/t9

    Normalised fiducial differential tW production cross section as a function of the $m(e^{\pm}, \mu^{\pm}, j)$. The vertical bars on the...

  • Figure 8e

    Data from Figure 8 (bottom left), located on page 17.

    10.17182/hepdata.128942.v1/t10

    Normalised fiducial differential tW production cross section as a function of the $\Delta\phi(e^{\pm}, \mu^{\pm})/\pi$. The vertical bars on the points...

  • Figure 8f

    Data from Figure 8 (bottom right), located on page 17.

    10.17182/hepdata.128942.v1/t11

    Normalised fiducial differential tW production cross section as a function of the $m_{T}(e^{\pm}, \mu^{\pm}, j, p_{T}^{miss})$. The vertical bars on...

  • Tables 4 and 5

    Data from Tables 4 and 5 located on page 15.

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    The p-values from the goodness-of-fit tests comparing the six differential cross section measurements with the predictions from POWHEG (PH) +...

  • Supplemental material: Lep1_Pt response matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t13

    Response matrix between detector and particle level for the $Leading$ $lepton$ $p_{T}$.

  • Supplemental material: Lep1Lep2Jet1MET_Pz response matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t14

    Response matrix between detector and particle level for the $p_{Z}(e^{\pm}, \mu^{\pm}, j)$.

  • Supplemental material: Jet1_Pt response matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t15

    Response matrix between detector and particle level for the $Jet$ $p_{T}$.

  • Supplemental material: Lep1Lep2Jet1_M response matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t16

    Response matrix between detector and particle level for the $m(e^{\pm}, \mu^{\pm}, j)$.

  • Supplemental material: Lep1Lep2_DPhi response matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t17

    Response matrix between detector and particle level for the $\Delta\phi(e^{\pm}, \mu^{\pm})/\pi$.

  • Supplemental material: Lep1Lep2Jet1MET_Mt response matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t18

    Response matrix between detector and particle level for the $m_{T}(e^{\pm}, \mu^{\pm}, j, p_{T}^{miss})$.

  • Supplemental material: Lep1_Pt covariance matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t19

    Covariance matrix including all uncertainties of the differential result for the $Leading$ $lepton$ $p_{T}$.

  • Supplemental material: Lep1Lep2Jet1MET_Pz covariance matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t20

    Covariance matrix including all uncertainties of the differential result for the $p_{Z}(e^{\pm}, \mu^{\pm}, j)$.

  • Supplemental material: Jet1_Pt covariance matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t21

    Covariance matrix including all uncertainties of the differential result for the $Jet$ $p_{T}$.

  • Supplemental material: Lep1Lep2Jet1_M covariance matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t22

    Covariance matrix including all uncertainties of the differential result for the $m(e^{\pm}, \mu^{\pm}, j)$.

  • Supplemental material: Lep1Lep2_DPhi covariance matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t23

    Covariance matrix including all uncertainties of the differential result for the $\Delta\phi(e^{\pm}, \mu^{\pm})/\pi$.

  • Supplemental material: Lep1Lep2Jet1MET_Mt covariance matrix

    Supplemental material.

    10.17182/hepdata.128942.v1/t24

    Covariance matrix including all uncertainties of the differential result for the $m_{T}(e^{\pm}, \mu^{\pm}, j, p_{T}^{miss})$.

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