Vector leptoquarks beyond tree level
Javier Fuentes-Martín, Gino Isidori, Matthias König, Nudžeim Selimović
Abstract
Models with massive vector leptoquarks, resulting from an $SU(4)$ gauge symmetry spontaneously broken at the TeV scale, are of great phenomenological interest given the current ``anomalies'' in semileptonic $B$ decays. We analyze the relations between low- and high-energy observables in such class of models to next-to-leading order accuracy in the $SU(4)$ gauge coupling ${g}_{4}$. For large values of ${g}_{4}$, motivated by recent $B$-physics data, one-loop corrections are sizable. The main effect is an enhanced contribution at low energy at fixed on-shell couplings. This result has important implications for current and future high-energy searches of vector leptoquark models.