The spectrum of an SU(3) gauge theory with a fundamental Higgs field

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Annals of Physics

DOI:https://doi.org/10.1016/J.AOP.2018.08.018· OSTI ID:22852299

Maas, Axel; Törek, Pascal ^[1]

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1. Institute of Physics, NAWI Graz, University of Graz, Universitätsplatz 5, Graz, 8010 (Austria)

In gauge theories, the physical, experimentally observable spectrum consists only of gauge-invariant states. This spectrum can be different from the elementary spectrum even at weak coupling and in the presence of the Brout–Englert–Higgs effect. We demonstrate this for an SU(3) gauge theory with a single fundamental Higgs, a toy theory for grand-unified theories. The manifestly gauge-invariant approach of lattice gauge theory is used to determine the spectrum in four different channels. It is found to be qualitatively different from the elementary one, and especially from the one predicted by standard perturbation theory. The result can be understood in terms of the Fröhlich–Morchio–Strocchi mechanism. In fact, we find that analytic methods based on this mechanism, a gauge-invariant extension of perturbation theory, correctly determine the spectrum, and give already at leading order a reasonably good quantitative description. Together with previous results this supports that this approach is the analytic method of choice for theories with a Brout–Englert–Higgs effect.

• OSTI ID: 22852299
• Journal Information: Annals of Physics, Journal Name: Annals of Physics Vol. 397; ISSN 0003-4916; ISSN APNYA6
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
GAUGE INVARIANCE
HIGGS BOSONS
HIGGS MODEL
LATTICE FIELD THEORY
PERTURBATION THEORY
SPECTRA
STANDARD MODEL
WEAK-COUPLING MODEL