Aad, G.ATLAS Collaboration,2016-11-092016-11-092014Journal of High Energy Physics (JHEP), 2014; 2014(9):037-1-037-421029-84791126-6708http://hdl.handle.net/2440/102345This paper presents a search for new particles in events with one lepton (electron or muon) and missing transverse momentum using 20.3 fb⁻¹ of proton-proton collision data at √s = 8 TeV recorded by the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. A W′ with Sequential Standard Model couplings is excluded at the 95% confidence level for masses up to 3.24 TeV. Excited chiral bosons (W*) with equivalent coupling strengths are excluded for masses up to 3.21TeV. In the framework of an effective field theory limits are also set on the dark matter-nucleon scattering cross-section as well as the mass scale M∗ of the unknown mediating interaction for dark matter pair production in association with a leptonically decaying W.enOpen Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP³.Journal article003001302310.1007/JHEP09(2014)0370003418788000012-s2.0-849750972582-s2.0-84925869138129379