Regular Article - Theoretical Physics
Simplified models of vector SU(4) leptoquarks at the TeV
Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126, Pisa, Italy
2 PRISMA+ Cluster of Excellence and MITP, Johannes Gutenberg Universität, 55099, Mainz, Germany
3 Physik-Institut, Universität Zürich, 8057, Zürich, Switzerland
Accepted: 29 November 2022
Published online: 22 December 2022
Assuming confirmation of the anomalies in semi-leptonic B-decays, their explanation in terms of the exchange of a massive vector leptoquark field, , of charge 2/3, appears to require the inclusion of in the vector multiplet of the adjoint of Pati–Salam SU(4), , as well as the introduction of vector-like fermions, , in the fundamental of SU(4). We consider simplified models characterised by the nature of the SU(4) symmetry (global or local), by the number of vector-like fermions, and by the couplings of the Higgs boson to SM fermions (direct or induced by mixing with the vector-like fermions). In all cases, we implement a minimal breaking of a flavour symmetry, with a single motivated exception. We then perform a global fit including the main observables sensitive to exchanges of the at tree level and in loops dominated by logs insensitive to the UV completion.
© The Author(s) 2022
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