Prospects for observing the Kaluza-Klein excitations of the W boson in the ATLAS detector at the LHC
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Kaluza-Klein excitations of the gauge bosons are a notable feature of theories with “small” (~ 1 TeV) extra dimensions. The leptonic decays of the excitations of the W boson provide at the LHC the striking signature of events containing an isolated high P T lepton accompanied by a high transverse momentum imbalance.
We investigate the reach for these signatures through a parametrized simulation of the ATLAS detector. With an integrated luminosity of 100 fb–1 a peak in the transverse invariant mass of the lepton-neutrino system will be detected if the compactification scale (M c ) is below 6 TeV. If no signal is observed, with an integrated luminosity of 100 fb–1 a limit of M c >11.7 TeV can be obtained from the study of the lepton-neutrino transverse mass distribution below the peak. If a peak is detected, a measurement of the couplings of the boson to leptons and quarks can be performed for M c up to ~5 TeV.
PACS: 11.10Kk – 11.25Mj – 13.85-t