6533b855fe1ef96bd12b07d4
RESEARCH PRODUCT
Dynamical origin of the electroweak scale and the 125 GeV scalar
Roshan FoadiStefano Di ChiaraSara TähtinenKimmo Tuominensubject
Nuclear and High Energy PhysicsParticle physicsStandard ModelHigh Energy Physics::LatticeSTANDARD MODELFOS: Physical sciencesTechnicolorMASS114 Physical sciences01 natural sciencesSYMMETRY-BREAKINGHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics - Lattice0103 physical sciencesbeyond-the-Standard-Modellcsh:Nuclear and particle physics. Atomic energy. Radioactivity010306 general physicsBosonPhysicsGauge bosonta114electroweak symmetry breaking010308 nuclear & particles physicsHigh Energy Physics - Lattice (hep-lat)Electroweak interactionHigh Energy Physics::PhenomenologyScalar (physics)BOSONHigh Energy Physics - PhenomenologyHiggs bosonmasslcsh:QC770-798LHCElectroweak scaleScalar fielddescription
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, {\em {\em 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-11-01 | Nuclear Physics B |