Top quark induced effective potential in a composite Higgs model

Abstract

We consider non-perturbative aspects of a composite Higgs model that serves as a prototype for physics beyond the Standard Model, in which a new strongly interacting sector undergoes chiral symmetry breaking, and generates the Higgs particle as a pseudo Nambu-Goldstone boson. In addition, the top quark couples linearly to baryons of the new strong sector, thereby becoming partially composite. We study the dynamics leading to the top quark Yukawa coupling as well as the top quark contribution to the effective potential for the Higgs, obtaining expressions for these couplings in terms of baryonic correlation functions in the underlying strongly interacting theory. We then show that a large-N limit exists in which the top quark contribution to the Higgs effective potential overcomes that of the weak gauge bosons, inducing electroweak symmetry breaking. The same large-N limit also suggests that the baryons that couple to the top quark may be relatively light. This composite Higgs model, and similar ones, can be studied on the lattice with the methods developed for lattice QCD.

Revtex, 28 pages, 3 figures. A few minor errors have been corrected

References in corpus (4)

• A custodial symmetry for Zbb
• The Higgs boson from an extended symmetry
• UV Completions of Partial Compositeness: The Case for a SU(4) Gauge Group
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Cited by in corpus (7)

• Spectroscopy of SU(4) gauge theory with two flavors of sextet fermions
• Radiative contribution to the composite-Higgs potential in a two-representation lattice model
• Modelling vector-like quarks in partial compositeness framework
• Baryon asymmetry generation in the E6CHM
• Same-sign W pair production in composite Higgs models
• Vacuum misalignment in presence of four-Fermi operators
• Towards a composite Higgs and a partially composite top quark