Top-philic Z forces at the LHC

Patrick J. Fox, Ian Low, Yue Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Despite extensive searches for an additional neutral massive gauge boson at the LHC, a Z 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 ananomalous 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.

Original languageEnglish (US)
Article number74
JournalJournal of High Energy Physics
Issue number3
StatePublished - Mar 1 2018


  • Anomalies in Field and String Theories
  • Beyond Standard Model

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Top-philic Z forces at the LHC'. Together they form a unique fingerprint.

Cite this