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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 ATLASdetector at the LHC during 2015-2018 is used in the search. The observedtransverse mass distribution computed from the lepton and missing transversemomenta is consistent with the distribution expected from the Standard Model,and upper limits on the cross section for $pp \to W^\prime \to \ell\nu$ areextracted ($\ell = e$ or $\mu$). These vary between 1.3 pb and 0.05 fbdepending 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 witha mass below 6.0 TeV and 5.1 TeV are excluded in the electron and muonchannels, respectively, in a model with a resonance that has couplings tofermions identical to those of the Standard Model $W$ boson. Cross-sectionlimits are also provided for resonances with several fixed $\Gamma / m$ valuesin the range between 1% and 15%. Model-independent limits are derived insingle-bin signal regions defined by a varying minimum transverse massthreshold. 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.

physical review. d/physical review. d.

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