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Search for a heavy charged boson in events with a charged lepton and missing transverse momentum from $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The collaboration
No Journal Information, 2019

Abstract (data abstract)
CERN-LHC. A search for a heavy charged-boson resonance decaying into a charged lepton (electron or muon) and a neutrino is reported. A data sample of 139 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 13$ TeV collected with the ATLAS detector at the LHC during 2015-2018 is used in the search. The observed transverse mass distribution computed from the lepton and missing transverse momenta is consistent with the distribution expected from the Standard Model, and upper limits on the cross section for $pp \to W^\prime \to l\nu$ are extracted ($l = e$ or $\mu$). These vary between 1.3 pb and 0.05 fb depending on the resonance mass in the range between 0.15 and 7.0 TeV at 95% confidence level for the electron and muon channels combined. Gauge bosons with a mass below 6.0 TeV and 5.1 TeV are excluded in the electron and muon channels, respectively, in a model with a resonance that has couplings to fermions identical to those of the Standard Model $W$ boson. Cross-section limits are also provided for resonances with several fixed $\Gamma / m$ values in the range between 1% and 15%. Model-independent limits are derived in single-bin signal regions defined by a varying minimum transverse mass threshold. The resulting visible cross-section upper limits range between 4.6 (15) pb and 22 (22) ab as the threshold increases from 130 (110) GeV to 5.1 (5.1) TeV in the electron (muon) channel.

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Figure 1 (a) in paper

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Transverse mass distribution for events satisfying all selection criteria in the electron channel.

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Figure 1 (b) in paper

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Transverse mass distribution for events satisfying all selection criteria in the muon channel.

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Figure 2 (a) in paper

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Upper limits at the 95% CL on the cross section for SSM $W^\prime$ production and decay to the electron+neutrino channel...

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Figure 2 (b) in paper

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Upper limits at the 95% CL on the cross section for SSM $W^\prime$ production and decay to the muon+neutrino channel...

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Figure 2 (c) in paper

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Combined (electron and muon channels) upper limits at the 95% CL on the cross section for SSM $W^\prime$ production and...

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Figure 3 (a) in paper

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Observed upper limits at the 95% CL on the cross section for generic $W^\prime$ production and decay to the electron+neutrino...

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Figure 3 (b) in paper

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Observed upper limits at the 95% CL on the cross section for generic $W^\prime$ production and decay to the muon+neutrino...

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Figure 3 (c) in paper

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Combined (electron and muon channels) observed upper limits at the 95% CL on the cross section for generic $W^\prime$ production...

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Figure 4 (a) in paper

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Observed upper limits at the 95% CL on the visible cross section in the electron+neutrino channel as a function of...

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Figure 4 (b) in paper

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Observed upper limits at the 95% CL on the visible cross section in the muon+neutrino channel as a function of...

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Figure 1 in auxiliary material

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Product of acceptance and efficiency for the electron and muon selections as a function of the $W^\prime$ pole mass.

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Figure 5 (a) in auxiliary material

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Expected upper limits at the 95% CL on the cross section for generic $W^\prime$ production and decay to the electron+neutrino...

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Figure 5 (b) in auxiliary material

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Expected upper limits at the 95% CL on the cross section for generic $W^\prime$ production and decay to the muon+neutrino...

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Figure 5 (c) in auxiliary material

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Combined (electron and muon channels) expected upper limits at the 95% CL on the cross section for generic $W^\prime$ production...