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Four-fermion limit of gauge-Yukawa theories
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 92, no 8, 085043Article in journal (Refereed) Published
Abstract [en]

We elucidate and extend the conditions that map gauge-Yukawa theories at low energies into time-honored gauged four-fermion interactions at high energies. These compositeness conditions permit us to investigate theories of composite dynamics through gauge-Yukawa theories. Here we investigate whether perturbative gauge-Yukawa theories can have a strongly coupled limit at high energy that can be mapped into a four-fermion theory. Interestingly, we are able to precisely carve out a region of the perturbative parameter space supporting such a composite limit. This has interesting implications on our current view on models of particle physics. As a template model we use an SU(N-C) gauge theory with N-F Dirac fermions transforming according to the fundamental representation of the gauge group. The fermions further interact with a gauge singlet complex N-F x N-F Higgs boson that ceases to be a physical degree of freedom at the ultraviolet composite scale, where it gives away to the four-fermion interactions. We compute the hierarchy between the ultraviolet and infrared composite scales of the theory and show that they are naturally large and well separated. Our results show that some weakly coupled gauge-Yukawa theories can be viewed, in fact, as composite theories. It is therefore tantalizing to speculate that the standard model, with its phenomenological perturbative Higgs sector, could hide, in plain sight, a composite theory.

Place, publisher, year, edition, pages
American Physical Society , 2015. Vol. 92, no 8, 085043
National Category
Subatomic Physics Other Physics Topics
URN: urn:nbn:se:kth:diva-177417DOI: 10.1103/PhysRevD.92.085043ISI: 000363529300011ScopusID: 2-s2.0-84946866884OAI: diva2:873624

QC 20151124

Available from: 2015-11-24 Created: 2015-11-20 Last updated: 2015-11-24Bibliographically approved

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Mojaza, Matin
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