A $B-$anomaly motivated $Z^{\prime }$ boson at the energy and precision frontiers

Abstract

TeV-scale $Z^{\prime }$ bosons with family-dependent couplings can explain some anomalies inferred from $B-$meson measurements of processes involving the $b\to s{\ell }^{+}{\ell }^{-}$ transition. A $Z^{\prime }$ originating from kinetically-mixed spontaneously broken $U(1{)}_{B_3-L_2}$ gauge symmetry has been shown to greatly ameliorate global fits~\cite{Allanach:2024ozu} in a `flavour-preferred' region of parameter space. We provide an exploration of this region at the high luminosity (HL-)LHC with particular attention to which signals could be verified across different discovery modes. Even if the HL-LHC does not discover the $Z^{\prime }$ boson in a resonant di-lepton channel, a FCC-ee $Z$-pole run would detect oblique corrections to the electroweak precision observables (EWPOs). Changes due to $Z^{\prime }$-induced non-oblique corrections are unlikely to be detected, to within experimental precision. In any case, the extended discovery potential offered by a 100 TeV $pp-$collider would afford sensitivity to the entire flavour-preferred region and enable a fine-grained and forensic analysis of the~model.

20 Pages, 9 figures, 2 tables, author final version published at Physics Letters B

References in corpus (21)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• FeynRules - Feynman rules made easy
• The global electroweak fit at NNLO and prospects for the LHC and ILC
• Dimension-8 Operators in the Standard Model Effective Field Theory
• Search for heavy Higgs bosons decaying into two tau leptons with the ATLAS detector using $pp$ collisions at $\sqrt{s}=13$ TeV
• CEPC Technical Design Report -- Accelerator (v2)
• Improved Theory Predictions and Global Analysis of Exclusive $\mathbf{b}\to \mathbf{s}{\mathbf{\mu }}^{+}{\mathbf{\mu }}^{-}$ Processes
• Constraints on Lepton Universality Violation from Rare $B$ Decays
• Rare $b$ decays meet high-mass Drell-Yan
• To (b)e or not to (b)e: No electrons at LHCb
• Drell-Yan Tails Beyond the Standard Model
• Standard Model predictions for $B\to K{\ell }^{+}{\ell }^{-}$, $B\to K{\ell }_1^{-}{\ell }_2^{+}$ and $B\to K\nu \bar{\nu }$ using form factors from $N_f=2+1+1$ lattice QCD
• Landau-Yang Theorem and Decays of a Z' Boson into Two Z Bosons
• More Synergies from Beauty, Top, $Z$ and Drell-Yan Measurements in SMEFT
• Exploiting dijet resonance searches for flavor physics
• Heavy resonances at energy-frontier hadron colliders
• Anomalous $Z^{\prime }$ bosons for anomalous $B$ decays
• Review of Semileptonic $B$ Anomalies
• Probing new $U(1)$ gauge symmetries via exotic $Z\to Z^{\prime }\gamma$ decays
• EFT, decoupling, Higgs boson mixing, and higher dimensional operators
• Doubling down on down-type diquarks