Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light 't Hooft Top Partners   Vector-like quarks, usually dubbed top partners, are a common presence in
composite Higgs models. Being composite objects, their mass is expected to be
of the order of their inverse size, that is the condensation scale of the new
strong interactions. Light top partners, while not being a generic prediction,
are however often considered in phenomenological models. We suggest that their
lightness may be due to the matching of global 't Hooft anomalies of the
underlying theory. We check this mechanism in explicit models showing that, in
one case, composite fermions with the quantum numbers of the top quark obtain a
mass which is controlled by a soft breaking term and can be made parametrically
small.

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The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex