CERN Accelerating science

The jet multiplicity in data and simulation before (left) and after (right) the b-jet veto. The $\PW$+jets contribution is modelled with {\sc MadGraph} 5.1.1+{\sc Pythia} 6.424. The solid band indicates the total statistical and systematic uncertainty in the $\PW$+jets signal and background predictions, as detailed in Section~\ref{systematics}. This includes uncertainties in the jet energy scale and resolution, the muon momentum scale and resolution, the pileup modelling, the b-tagging correction factors, the normalisations of the simulations, and the efficiencies of reconstruction, identification, and trigger acceptance. A substantial reduction in the expected $\ttbar$ background is observed in the right plot.

The jet multiplicity in data and simulation before (left) and after (right) the b-jet veto. The $\PW$+jets contribution is modelled with {\sc MadGraph} 5.1.1+{\sc Pythia} 6.424. The solid band indicates the total statistical and systematic uncertainty in the $\PW$+jets signal and background predictions, as detailed in Section~\ref{systematics}. This includes uncertainties in the jet energy scale and resolution, the muon momentum scale and resolution, the pileup modelling, the b-tagging correction factors, the normalisations of the simulations, and the efficiencies of reconstruction, identification, and trigger acceptance. A substantial reduction in the expected $\ttbar$ background is observed in the right plot.

The dominant systematic uncertainties in the measurement of the $\PW$+jets cross section as a function of the exclusive jet multiplicity. The systematic uncertainties displayed include the jet energy scale and resolution (JES, JER), the choice of generator used in the unfolding procedure (Generator), the statistical uncertainty propagated through the unfolding procedure (Statistical), the uncertainty due to a finite number of simulated events used to construct the response (MC stat.), and all other systematic uncertainties (All other) detailed in Section~\ref{systematics}. The uncertainties presented here correspond to the weighted average of the values shown in Table~\ref{tab:sysranges}.

The cross section measurement for the exclusive and inclusive jet multiplicities, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The cross section measurement for the exclusive and inclusive jet multiplicities, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for the leading four jets transverse momentum, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for the leading four jets transverse momentum, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for the leading four jets transverse momentum, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for the leading four jets transverse momentum, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for \HT for inclusive jet multiplicities 1--4, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for \HT for inclusive jet multiplicities 1--4, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for \HT for inclusive jet multiplicities 1--4, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for \HT for inclusive jet multiplicities 1--4, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for the pseudorapidity of the four leading jets, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for the pseudorapidity of the four leading jets, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for the pseudorapidity of the four leading jets, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement for the pseudorapidity of the four leading jets, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement in $\Delta \phi (\text{jet}_n, \mu)$, for $n = 1$ - $4$, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement in $\Delta \phi (\text{jet}_n, \mu)$, for $n = 1$ - $4$, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement in $\Delta \phi (\text{jet}_n, \mu)$, for $n = 1$ - $4$, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The differential cross section measurement in $\Delta \phi (\text{jet}_n, \mu)$, for $n = 1$ - $4$, compared to the predictions of \MADGRAPH 5.1.1 + \PYTHIA 6.426, \SHERPA 1.4.0, and \BLACKHAT{}+\SHERPA (corrected for hadronisation and multiple-parton interactions). Black circular markers with the grey hatched band represent the unfolded data measurement and its uncertainty. Overlaid are the predictions together with their statistical uncertainties (Theory stat.). The \BLACKHAT{}+\SHERPA uncertainty also contains theoretical systematic uncertainties (Theory syst.) described in Section~\ref{results}. The lower plots show the ratio of each prediction to the unfolded data.

The ratio of the cross section measurements, and of the predictions of \BLACKHAT{}+\SHERPA using the MSTW2008nlo68cl and NNPDF PDF sets, to the prediction of \BLACKHAT{}+\SHERPA using the CT10 PDF set, for four different quantities. Black circular markers represent the unfolded data measurement and its uncertainty. The grey hatched band indicates the PDF uncertainty on the \BLACKHAT{}+\SHERPA predictions with CT10. Triangular (square) markers indicate the ratio of the prediction MSTW2008nlo68cl (NNPDF) to the CT10 prediction, including the PDF uncertainty for the given PDF set.

The ratio of the cross section measurements, and of the predictions of \BLACKHAT{}+\SHERPA using the MSTW2008nlo68cl and NNPDF PDF sets, to the prediction of \BLACKHAT{}+\SHERPA using the CT10 PDF set, for four different quantities. Black circular markers represent the unfolded data measurement and its uncertainty. The grey hatched band indicates the PDF uncertainty on the \BLACKHAT{}+\SHERPA predictions with CT10. Triangular (square) markers indicate the ratio of the prediction MSTW2008nlo68cl (NNPDF) to the CT10 prediction, including the PDF uncertainty for the given PDF set.

The ratio of the cross section measurements, and of the predictions of \BLACKHAT{}+\SHERPA using the MSTW2008nlo68cl and NNPDF PDF sets, to the prediction of \BLACKHAT{}+\SHERPA using the CT10 PDF set, for four different quantities. Black circular markers represent the unfolded data measurement and its uncertainty. The grey hatched band indicates the PDF uncertainty on the \BLACKHAT{}+\SHERPA predictions with CT10. Triangular (square) markers indicate the ratio of the prediction MSTW2008nlo68cl (NNPDF) to the CT10 prediction, including the PDF uncertainty for the given PDF set.

The ratio of the cross section measurements, and of the predictions of \BLACKHAT{}+\SHERPA using the MSTW2008nlo68cl and NNPDF PDF sets, to the prediction of \BLACKHAT{}+\SHERPA using the CT10 PDF set, for four different quantities. Black circular markers represent the unfolded data measurement and its uncertainty. The grey hatched band indicates the PDF uncertainty on the \BLACKHAT{}+\SHERPA predictions with CT10. Triangular (square) markers indicate the ratio of the prediction MSTW2008nlo68cl (NNPDF) to the CT10 prediction, including the PDF uncertainty for the given PDF set.