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Journal Article
Top-philic Z′ forces at the LHC
2018
Overview
A
bstract
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.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V,Springer Berlin,SpringerOpen
