Abstract (data abstract)

The production of a $W$ boson in association with a single charm quark is studied using 140 $\mathrm{fb}^{-1}$ of $\sqrt{s} = 13\,\mathrm{TeV}$ proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The charm quark is tagged by a charmed hadron, reconstructed with a secondary-vertex fit. The $W$ boson is reconstructed from an electron/muon decay and the missing transverse momentum. The mesons reconstructed are $D^{\pm} \to K^\mp \pi^\pm \pi^\pm$ and $D^{*\pm} \to D^{0} \pi^\pm \to (K^\mp \pi^\pm) \pi^\pm$, where $p_{\text{T}}(e, \mu) > 30\,\mathrm{GeV}$, $|\eta(e, \mu)| < 2.5$, $p_{\text{T}}(D) > 8\,\mathrm{GeV}$, and $|\eta(D)| < 2.2$. The integrated and normalized differential cross-sections as a function of the pseudorapidity of the lepton from the $W$ boson decay, and of the transverse momentum of the meson, are extracted from the data using a profile likelihood fit. The measured fiducial cross-sections are $\sigma^{\mathrm{OS-SS}}_{\mathrm{fid}}(W^{-}{+}D^{+}) = 50.2\pm0.2\,\mathrm{(stat.)}\,^{+2.4}_{-2.3}\,\mathrm{(syst.)}\,\mathrm{pb}$, $\sigma^{\mathrm{OS-SS}}_{\mathrm{fid}}(W^{+}{+}D^{-}) = 48.5\pm0.2\,\mathrm{(stat.)}\,^{+2.3}_{-2.2}\,\mathrm{(syst.)}\,\mathrm{pb}$, $\sigma^{\mathrm{OS-SS}}_{\mathrm{fid}}(W^{-}{+}D^{*+}) = 51.1\pm0.4\,\mathrm{(stat.)}\,^{+1.9}_{-1.8}\,\mathrm{(syst.)}\,\mathrm{pb}$, and $\sigma^{\mathrm{OS-SS}}_{\mathrm{fid}}(W^{+}{+}D^{*-}) = 50.0\pm0.4\,\mathrm{(stat.)}\,^{+1.9}_{-1.8}\,\mathrm{(syst.)}\,\mathrm{pb}$. Results are compared with the predictions of next-to-leading-order quantum chromodynamics calculations performed using state-of-the-art parton distribution functions. The ratio of charm to anti-charm production cross-sections is studied to probe the $s$-$\bar{s}$ quark asymmetry and is found to be $R_c^\pm = 0.971\pm0.006\,\mathrm{(stat.)}\pm0.011\,\mathrm{(syst.)}$.

Table 1

Data from Table 11, Page 34 of preprint

10.17182/hepdata.136060.v1/t1

Measured fiducial cross-sections times the single-lepton-flavor W boson branching ratio.
Table 2

Data from Table 11, Page 34 of preprint

10.17182/hepdata.136060.v1/t2

Measured cross section ratios for the W+D production. The $R_{c}(D^{(*)})$ observable is obtained by combining the individual measurements of $R_{c}(D^{+})$...
Table 3

Data from Table 18, Page 46 of preprint

10.17182/hepdata.136060.v1/t3

Measured $p_{\mathrm{T}}(D^{+})$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{-}+D^{+}$ channel. The last $p_{\mathrm{T}}$ bin...
Table 4

Data from Table 18, Page 46 of preprint

10.17182/hepdata.136060.v1/t4

Measured $p_{\mathrm{T}}(D^{-})$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{+}+D^{-}$ channel. The last $p_{\mathrm{T}}$ bin...
Table 5

Data from Table 19, Page 47 of preprint

10.17182/hepdata.136060.v1/t5

Measured $|\eta(\ell)|$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{-}+D^{+}$ channel. The displayed cross sections...
Table 6

Data from Table 19, Page 47 of preprint

10.17182/hepdata.136060.v1/t6

Measured $|\eta(\ell)|$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{+}+D^{-}$ channel. The displayed cross sections...
Table 7

Data from Table 20, Page 47 of preprint

10.17182/hepdata.136060.v1/t7

Measured $p_{\mathrm{T}}(D^{*+})$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{-}+D^{*+}$ channel. The last $p_{\mathrm{T}}$ bin...
Table 8

Data from Table 20, Page 47 of preprint

10.17182/hepdata.136060.v1/t8

Measured $p_{\mathrm{T}}(D^{*-})$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{+}+D^{*-}$ channel. The last $p_{\mathrm{T}}$ bin...
Table 9

Data from Table 21, Page 48 of preprint

10.17182/hepdata.136060.v1/t9

Measured $|\eta(\ell)|$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{-}+D^{*+}$ channel. The displayed cross sections...
Table 10

Data from Table 21, Page 48 of preprint

10.17182/hepdata.136060.v1/t10

Measured $|\eta(\ell)|$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{+}+D^{*-}$ channel. The displayed cross sections...
Table 11

Data from Figure 11a, Page 49 of preprint

10.17182/hepdata.136060.v1/t11

The data statistical uncertainty covariance matrix for the differential $p_{\mathrm{T}}(D^{\pm})$ fit in the $D^{\pm}$ channel (Tables 3 and 4).
Table 12

Data from Figure 11b, Page 49 of preprint

10.17182/hepdata.136060.v1/t12

The data statistical uncertainty covariance matrix for the differential $|\eta(\ell)|$ fit in the $D^{\pm}$ channel (Tables 5 and 6).
Table 13

Data from Figure 11c, Page 49 of preprint

10.17182/hepdata.136060.v1/t13

The data statistical uncertainty covariance matrix for the differential $p_{\mathrm{T}}(D^{*\pm})$ fit in the $D^{*\pm}$ channel (Tables 7 and 8).
Table 14

Data from Figure 11d, Page 49 of preprint

10.17182/hepdata.136060.v1/t14

The data statistical uncertainty covariance matrix for the differential $|\eta(\ell)|$ fit in the $D^{*\pm}$ channel (Tables 9 and 10).
Table 15

Data from Figure 12a, Page 50 of preprint

10.17182/hepdata.136060.v1/t15

The combined statistical and systematic uncertainty covariance matrix for the differential $p_{\mathrm{T}}(D^{\pm})$ fit in the $D^{\pm}$ channel (Tables 3 and...
Table 16

Data from Figure 12b, Page 50 of preprint

10.17182/hepdata.136060.v1/t16

The combined statistical and systematic uncertainty covariance matrix for the differential $|\eta(\ell)|$ fit in the $D^{\pm}$ channel (Tables 5 and...
Table 17

Data from Figure 12c, Page 50 of preprint

10.17182/hepdata.136060.v1/t17

The combined statistical and systematic uncertainty covariance matrix for the differential $p_{\mathrm{T}}(D^{*\pm})$ fit in the $D^{*\pm}$ channel (Tables 7 and...
Table 18

Data from Figure 12d, Page 50 of preprint

10.17182/hepdata.136060.v1/t18

The combined statistical and systematic uncertainty covariance matrix for the differential $|\eta(\ell)|$ fit in the $D^{*\pm}$ channel (Tables 9 and...
Table 19

Data from Table 7, auxiliary material

10.17182/hepdata.136060.v1/t19

Measured $|\eta(\ell)|$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{-}+D^{+}$ channel with the full breakdown...
Table 20

Data from Table 7, auxiliary material

10.17182/hepdata.136060.v1/t20

Measured $|\eta(\ell)|$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{+}+D^{-}$ channel with the full breakdown...
Table 21

Data from Table 8, auxiliary material

10.17182/hepdata.136060.v1/t21

Measured $|\eta(\ell)|$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{-}+D^{*+}$ channel with the full breakdown...
Table 22

Data from Table 8, auxiliary material

10.17182/hepdata.136060.v1/t22

Measured $|\eta(\ell)|$ differential fiducial cross-section times the single-lepton-flavor W boson branching ratio in the $W^{+}+D^{*-}$ channel with the full breakdown...
Table 23

Data from Table 9, auxiliary material

10.17182/hepdata.136060.v1/t23

Descriptions of nuisance parameters.

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