Search for new particles in events with one lepton and missing transverse momentum in pp collisions at sqrt(s) = 8 TeV

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 \sqrt{s} = 8 TeV recorded by the ATLAS experiment. Many models predict the existence of heavy gauge bosons. The first new physics scenario that is investigated is the Sequential Standard Model (SSM), the extended gauge model of ref. [1]. This model proposes the existence of additional heavy gauge bosons, of which the charged ones are commonly denoted as W'. The W' has the same couplings to fermions as the SM W boson and a width that increases linearly with the WŒ mass. The second new physics scenario that is investigated originates from ref. [2] and proposes the existence of charged partners, denoted W*, of the chiral boson excitations described in ref. [3]. The anomalous (magnetic moment-type) coupling of the W* leads to kinematic distributions significantly different from those of the W'. [1] G. Altarelli, B. Mele, and M. Ruiz-Altaba, Searching for new heavy vector bosons in pp colliders, Z. Phys. C 45(1989) 109. [2] M. Chizhov and G. Dvali, Origin and Phenomenology of Weak-Doublet Spin-1 Bosons, Phys Lett. B 703 (2011) 593-598 [3] M. Chizhov, V. Bednyakov, and J. Budagov, Proposal for chiral bosons search at LHC via their unique new signature, Phys. Atom. Nucl. 71 (2008) 2096-2100