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Dark decay of the top quark

Kyoungchul Kong1, Hye-Sung Lee2,3, and Myeonghun Park4

  • 1Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA
  • 2Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA
  • 3Theory Center, Jefferson Lab, Newport News, Virginia 23606, USA
  • 4Kavli IPMU (WPI), The University of Tokyo, Kashiwa, 277-8583, Japan

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Phys. Rev. D 89, 074007 – Published 1 April, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.074007

Abstract

We suggest top quark decays as a venue to search for light dark force carriers. The top quark is the heaviest particle in the standard model whose decays are relatively poorly measured, allowing sufficient room for exotic decay modes from new physics. A very light (GeV scale) dark gauge boson (Z′) is a recently highlighted hypothetical particle that can address some astrophysical anomalies as well as the 3.6σ deviation in the muon g−2 measurement. We present and study a possible scenario that top quark decays as t→bW+Z′s. This is the same as the dominant top quark decay (t→bW) accompanied by one or multiple dark force carriers. The Z′ can be easily boosted, and it can decay into highly collimated leptons (lepton-jet) with large branching ratio. We discuss the implications for the Large Hadron Collider experiments including the analysis based on the lepton-jets.

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Phys. Rev. D 89, 074007– Published 1 April, 2014
  • Received 30 January 2014

© 2014 American Physical Society

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