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  • Letter
  • Open Access

W-boson exotic decay into three charged leptons at the LHC

Yifan Fei1,*, Peiran Li2,†, Zhen Liu2,‡, Kun-Feng Lyu2,§, and Maxim Pospelov2,3,∥

  • 1Department of Physics and Center for Field Theory and Particle Physics, Fudan University, Shanghai 200438, China
  • 2School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 3William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • *Contact author: 20307130006@fudan.edu.cn
  • †Contact author: li001800@umn.edu
  • ‡Contact author: zliuphys@umn.edu
  • §Contact author: lyu00145@umn.edu
  • ∥Contact author: pospelov@umn.edu
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Phys. Rev. D 110, L111302 – Published 26 December, 2024

DOI: https://doi.org/10.1103/PhysRevD.110.L111302

Abstract

We investigate the W boson’s exotic decay channel, W→ℓℓℓν, at the LHC. Although the four-body final states suppress the decay branching ratio, the large production of W bosons makes detecting and precisely measuring this decay probability entirely feasible. Our simulation study indicates that this tiny branching ratio can be measured with subpercent precision at the HL-LHC. This decay channel can also constrain Standard Model extensions. Using the Lμ−Lτ model as a benchmark, we find that the current bound on the gauge coupling for Z′ mass in the range of [4, 75] GeV can significantly improve.

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Phys. Rev. D 110, L111302– Published 26 December, 2024
  • Received 4 September 2024
  • Accepted 25 November 2024
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