High-pT Signatures in Vector-Leptoquark Models

Abstract

We present a detailed analysis of the collider signatures of TeV-scale massive vector bosons motivated by the hints of lepton flavour non-universality observed in $B$-meson decays. We analyse three representations that necessarily appear together in a large class of ultraviolet-complete models: a colour-singlet ($Z^{\prime }$), a colour-triplet (the $U_1$ leptoquark), and a colour octet ($G^{\prime }$). Under general assumptions for the interactions of these exotic states with Standard Model fields, including in particular possible right-handed and flavour off-diagonal couplings for the $U_1$, we derive a series of stringent bounds on masses and couplings that constrain a wide range of explicit new-physics models.

23 pages, 11 figures. v2: Minor modifications and references added. v3: Matching the journal version. The Feynrules and UFO files used for this work can be found at https://feynrules.irmp.ucl.ac.be/wiki/LeptoQuark

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• Quark masses, CKM angles and Lepton Flavour Universality violation