Dynamical origin of the electroweak scale and the 125 GeV scalar

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Di Chiara , S , Foadi , R , Tuominen , K & Tähtinen , S 2015 , ' Dynamical origin of the electroweak scale and the 125 GeV scalar ' , Nuclear Physics, Section B , vol. 900 , pp. 295-330 . https://doi.org/10.1016/j.nuclphysb.2015.09.013

Title: Dynamical origin of the electroweak scale and the 125 GeV scalar
Author: Di Chiara, Stefano; Foadi, Roshan; Tuominen, Kimmo; Tähtinen, Sara
Contributor organization: Helsinki Institute of Physics
Department of Physics
Date: 2015-11
Language: eng
Number of pages: 36
Belongs to series: Nuclear Physics, Section B
ISSN: 0550-3213
DOI: https://doi.org/10.1016/j.nuclphysb.2015.09.013
URI: http://hdl.handle.net/10138/159442
Abstract: We consider a fully dynamical origin for the masses of weak gauge bosons and heavy quarks of the Standard Model. Electroweak symmetry breaking and the gauge boson masses arise from new strong dynamics, which leads to the appearance of a composite scalar in the spectrum of excitations. In order to generate mass for the Standard Model fermions, we consider extended gauge dynamics, effectively represented by four fermion interactions at presently accessible energies. By systematically treating these interactions, we show that they lead to a large reduction of the mass of the scalar resonance. Therefore, interpreting the scalar as the recently observed 125 GeV state implies that the mass originating solely from new strong dynamics can be much heavier, i.e. of the order of 1 TeV. In addition to reducing the mass of the scalar resonance, we show that the four-fermion interactions allow for contributions to the oblique corrections in agreement with the experimental constraints. The couplings of the scalar resonance with the Standard Model gauge bosons and fermions are evaluated, and found to be compatible with the current LHC results. Additional new resonances are expected to be heavy, with masses of the order of a few TeVs, and hence accessible in future experiments. (C) 2015 The Authors. Published by Elsevier B.V.
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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