Strong dynamics with matter in multiple representations: [Formula omitted] gauge theory with fundamental and sextet fermions

We present a non-perturbative lattice study of [Formula omitted] gauge theory with two flavors of fermions in the fundamental representation and two in the two-index antisymmetric representation: a theory closely related to a minimal partial-compositeness model for physics beyond the Standard Model,...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2019-07, Vol.79 (8), p.1-26
Main Authors: Cossu, Guido, Del Debbio, Luigi, Panero, Marco, Preti, David
Format: Article
Language:English
Subjects:
Algorithms
Analysis
Computer simulation
Fermions
Flavor (particle physics)
Gauge theory
Lattice theory
Quarks
Representations
Solid phases
Standard model (particle physics)
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Summary:We present a non-perturbative lattice study of [Formula omitted] gauge theory with two flavors of fermions in the fundamental representation and two in the two-index antisymmetric representation: a theory closely related to a minimal partial-compositeness model for physics beyond the Standard Model, that was proposed by Ferretti. We discuss the phase structure of the lattice theory and report results for various observables of interest, including the masses of states obtained from different combinations of valence fermions and the spectrum of the Dirac operator. Finally, we comment on the extension of this type of studies to other partial-compositeness models (including, in particular, one that was recently suggested by Gertov et al.), which could admit lighter top-quark partners, highlighting some key features of our lattice simulation algorithm, that make it suitable for such generalizations.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-019-7137-1