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Top-philic Z′ forces at the LHC

Journal of High Energy Physics volume 2018, Article number: 74 (2018) Cite this article

A preprint version of the article is available at arXiv.

Abstract

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.

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Authors and Affiliations

  1. Theoretical Physics Department, Fermilab, Batavia, IL, 60510, U.S.A.

    Patrick J. Fox & Yue Zhang

  2. High Energy Physics Division, Argonne National Laboratory, Argonne, IL, 60439, U.S.A.

    Ian Low

  3. Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, U.S.A.

    Ian Low & Yue Zhang

  4. Theoretical Physics Department, CERN, 1211, Geneva 23, Switzerland

    Ian Low

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  1. Patrick J. Fox
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Correspondence to Yue Zhang.

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Fox, P.J., Low, I. & Zhang, Y. Top-philic Z′ forces at the LHC. J. High Energ. Phys. 2018, 74 (2018). https://doi.org/10.1007/JHEP03(2018)074

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Keywords

  • Anomalies in Field and String Theories
  • Beyond Standard Model