A search for resonances decaying into a $W$ boson and a radion, where the radion decays into two $W$ bosons, is presented. The data analyzed correspond to an integrated luminosity of $138{\mathrm{fb}}^{-1}$ recorded in proton-proton collisions with the CMS detector at $\sqrt{s}=13\mathrm{TeV}$. One isolated charged lepton is required, together with missing transverse momentum and one or two massive large-radius jets, containing the decay products of either two or one $W$ bosons, respectively. No excess over the background estimation is observed. The results are combined with those from a complementary channel with an all-hadronic final state, described in an accompanying paper. Limits are set on parameters of an extended warped extra-dimensional model. These searches are the first of their kind at the LHC.

• Received 20 January 2022
• Accepted 31 May 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.021802

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