1111.2580 (Vernon Barger et al.)

Dilaton at the LHC    [PDF]

Vernon Barger, Muneyuki Ishida, Wai-Yee Keung

The dilaton, a pseudo-Nambu-Goldstone boson appearing in spontaneous scale
symmetry breaking at a TeV scale f, may be found in Higgs boson searches. The
dilaton couples to standard model fermions and weak bosons with the same
structure as the Higgs boson except for the overall strength. Additionally, the
dilaton couples to a Higgs boson pair. The couplings of the dilaton to a gluon
pair and a photon pair, appearing at loop level, are largely enhanced compared
to the corresponding Higgs couplings. We present regions of the mass and VEV of
the dilaton allowed by WW, ZZ, and gammagamma limits from the LHC at 7 TeV with
1.0-2.3 fb-1 integrated luminosity. A scale of f less than 1 TeV is nearly
excluded. We discuss how the dilaton chi can be distinguished from the Higgs
boson h by observation of the decays chi -> gammagamma and chi -> hh ->
(WW)(WW).

View original: http://arxiv.org/abs/1111.2580