Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flavour constraints on multi-Higgs-doublet models: Yukawa alignment   In multi-Higgs-doublet models, the alignment in flavour space of all Yukawa
matrices coupling to a given right-handed fermion guarantees the absence of
tree-level flavour-changing neutral couplings, while introducing new sources of
CP violation. With N Higgs doublets (and no right-handed neutrinos) the Yukawa
Lagrangian is characterized by the fermion masses, the CKM quark mixing matrix
and 3(N-1) complex couplings. Quantum corrections break the alignment,
generating a minimal-flavour-violation structure with flavour-blind phases. The
aligned multi-Higgs-doublet models lead to a rich and viable phenomenology with
an interesting hierarchy of flavour-changing neutral current effects,
suppressing them in light-quark systems while allowing potentially relevant
signals in heavy-quark transitions.

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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg