Abstract
We study contributions to pp→W+W−→ℓνℓℓ′νℓ′ $$ pp\to {W}^{+}{W}^{-}\to \ell {\nu}_{\ell }{\ell}^{\prime }{\nu}_{\ell^{\prime }} $$ in models with a new Higgs boson, H, and a neutral lepton, ν4, with couplings H − ν4 − νμ and W − ν4 − μ $$ \mu $$ through the process pp → H → ν4νμ → Wμνμ → ℓνℓμνμ. Contrary to naive expectations, we find that contributions to pp → W W can be very large while satisfying constraints from standard H → W W and H → γγ searches. Even the excess observed by ATLAS in pp → W W , if taken at face value, can be easily accommodated. The various kinematic distributions fit nicely the experimentally determined ones. This scenario can arise for example in a two Higgs doublet model with vectorlike leptons.