Orientifold theory dynamics and symmetry breaking

By Francesco Sannino, K. Tuominen. 2004

374 citations recorded by the source corpus.

We show that it is possible to construct explicit models of electroweak symmetry breaking in which the number of techniflavors needed to enter the conformal phase of the theory is small and weakly dependent on the number of technicolors. Surprisingly, the minimal model with just two (techni)flavors, together with a suitable gauge dynamics, can be made almost conformal. The theories we consider are generalizations of orientifold-type gauge theories, in which the fermions are in either two-index symmetric or antisymmetric representation of the gauge group, as the underlying dynamics responsible for the spontaneous breaking of the electroweak symmetry. We first study their phase diagram and use the fact that specific sectors of these theories can be mapped into supersymmetric Yang-Mills theory to strengthen our results. This correspondence allows us also to have information on part of the nonperturbative spectrum. We propose and investigate some explicit models while briefly exploring relevant phenomenological consequences. Our theories can not only be tested at the next collider experiments but, due to their simple structure, can also be studied via current lattice simulations.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/bd7517f5c5bfb31bb4bfcd3cc7810951d825f2de

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In Nuclear and High Energy Physics

Citations in the corpus

Dark Matter from new Technicolor Theories (2006, methodology): “We have constructed explicit technicolor extensions of the SM passing the precision tests [5, 6, 7, 8].”
Light composite Higgs boson from higher representations versus electroweak precision measurements: P (2005, methodology): “However, we will shortly review arguments provided in [16], which lead to the same prediction of the conformal window.”
Higher representations on the lattice: numerical simulations. SU(2) with adjoint fermions (2008, background): “Theories with two Dirac fermions in the two–index symmetric representation and small number of colors (N = 2, 3) are currently under scrutiny as viable candidates for strongly– interacting BSM candidates [15, 16, 17].”
Search for new high-mass phenomena in the dilepton final state using 36 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}$ = 13 TeV with the ATLAS detector (2017, methodology): “These models include the Randall-Sundrum (RS) model [6] with a warped extra dimension giving rise to spin-2 graviton excitations, the quantum black-hole model [7], the Z∗ model [8], and the minimal walking technicolour model [9].”
Fundamental composite dynamics: A review (2020, methodology): “the number of underlying fermionic matter), the symmetry might not break at all because the theory can develop large distance conformality, as discussed in [19] for fermions in two-index representations, in [20] for a universal classification of SU(N) gauge theories and their applications to Technic”
Supersymmetry inspired QCD beta function (2007, methodology): “The result is simple and we compare it with the phase diagram presented in [4, 5, 6] obtained using the truncated Schwinger-Dyson approximation also referred as ladder approximation in [7, 8].”