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Top-philic $Z'$ Forces at the LHC
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abstract
Despite extensive searches for an additional neutral massive gauge boson at the LHC, a $Z^\prime$ at the weak scale could still be present if its couplings to the first two generations of quarks are suppressed, in which case the production in hadron colliders relies on tree-level processes in association with heavy flavors or one-loop processes in association with a jet. We consider the low-energy effective theory of a top-philic $Z'$ and present possible UV completions. We clarify theoretical subtleties in evaluating the production of a top-philic $Z'$ at the LHC and examine carefully the treatment of an anomalous $Z'$ current in the low-energy effective theory. Recipes for properly computing the production rate in the $Z'+j$ channel are given. We discuss constraints from colliders and low-energy probes of new physics. As an application, we apply these considerations to models that use a weak-scale $Z'$ to explain possible violations of lepton universality in $B$ meson decays, and show that the future running of a high luminosity LHC can potentially cover much of the remaining parameter space favored by this particular interpretation of the $B$ physics anomaly.
Forward citations
Cited by 5 Pith papers
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Search for a top-philic Z' boson decaying into a $\mathrm{t\bar{t}}$ pair in a final state with jets and an electron or muon in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
CMS sees no evidence for a top-philic Z' boson decaying to top-quark pairs and sets the tightest published cross-section limits for masses between 0.5 and 3 TeV.
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Analysis of axion-like particles in a top-quark pair production at the CLIC
A simulation shows the CLIC gamma-gamma mode could exclude ALP-top couplings down to about 0.11 TeV^-1 for ALP masses near 10 GeV.
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Effective field theory and scalar extensions of the top quark sector
For a heavy scalar coupled to top quarks, only an NLO-matched effective field theory reproduces the full model across the LHC energy range, while a leading-order fit overestimates the high-mass tail and LHC constraints.
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Dark CP Violation and Gauged Lepton/Baryon Number for Electroweak Baryogenesis
An electroweak baryogenesis model where dark-sector CP violation is transferred to Standard Model leptons through an anomalous U(1)_ℓ Z' background can produce the observed baryon asymmetry while evading current EDM bounds.
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Associated $Z^\prime$ production in the flavorful $U(1)$ scenario for $R_{K^{(*)}}$
A flavorful Z' model for the B-meson anomalies predicts discoverable associated-production signatures at the HL-LHC: dimuon + b-jets for M_Z' up to ~500 GeV and tri-muon + missing energy for larger muon couplings.
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