Two-index SU(N) theories: QCD, Orientifolds, Super Yang-Mills, Lattice and Steven Weinberg's $ππ$ scattering legacy
8 February 2024
High Energy Physics - Phenomenology
Two-index theories access complementary large-N QCD properties
Recent precise lattice data allows estimating 1/N^2 terms
Tetraquarks appear at leading order and unitarize meson scattering
Two-index limit better models low-energy dynamics than 't Hooft
Interplay with lattices continues elucidating non-perturbative QCD
Two-index theories reveal large-N QCD dynamics
This paper reviews how two-index SU(N) gauge theories with fermions, including QCD, super Yang-Mills, and meson scattering theories, provide information about the large-N limit. Comparisons to recent lattice results estimate the size of 1/N^2 corrections. Analysis of meson scattering dynamics honors Weinberg's work on tetraquarks, which naturally appear in two-index theories and help unitarize scattering.
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