Monday, March 18, 2013

1303.3615 (Tommi Alanne et al.)

LHC Data and Aspects of New Physics    [PDF]

Tommi Alanne, Stefano Di Chiara, Kimmo Tuominen
We consider the implications of current LHC data on new physics with strongly interacting sector(s). We parametrize the relevant interaction Lagrangian and study the best fit values in light of current data. These are then considered within a simple framework of bosonic technicolor. We consider first the effective Lagrangian containing only spin-0 composites of the underlying theory, which corresponds to a two Higgs doublet model. With respect to this baseline, then, the effects of the vector bosons, a staple in strong interacting theories, are illustrated by considering two parametric cases: first, the case where the effects of the vector bosons arise only through their mixing with the electroweak SU(2)_L gauge fields and, second, the case where also a direct interaction term exists. In the mixing only case, since W' contributes to the Fermi coupling, which fixes the electroweak scale to 246 GeV, all the Higgs linear couplings get rescaled compared to their Standard Model prediction. By combining the W' direct searches at ATLAS and the goodness of fit analysis we determine a general upper bound on the amount of mixing allowed by the experiment. More specifically for bosonic technicolor we find that the case of a W' coupling to the Higgs boson only via a non-negligible mixing with W is disfavored by the present data, while even a small direct W' coupling to the Higgs allows the tested model to fit satisfactorily the experimental results.
View original: http://arxiv.org/abs/1303.3615

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