Prospects for the detection of Kaluza-Klein excitations of gauge bosons in the ATLAS detector at the LHC
Université de Montréal, and TRIUMF (Vancouver), Canada
2 INFN, Sezione di Pavia, Via Bassi 6, Pavia, Italy
Accepted: 20 August 2003
Published online: 10 March 2004
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 γ and Z bosons provide a striking signature which can be detected at the LHC. 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 lepton-lepton invariant mass will be detected if the compactification scale (M c ) is below 5.8 TeV. If no peak is observed, with an integrated luminosity of 300 fb–1 a limit of M c <12–13.5 TeV can be obtained from a detailed study of the shape of the lepton-lepton invariant mass distribution. If a peak is observed, the study of the angular distribution of the two leptons will allow to distinguish the KK excitations from alternative models yielding the same signature.
PACS: 11.10Kk – 11.25Mj – 13.85-t
© Società Italiana di Fisica, Springer-Verlag, 2005