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Top Yukawa coupling determination at high energy muon collider

Zhen Liu1, Kun-Feng Lyu1, Ishmam Mahbub1, and Lian-Tao Wang2,3,4

  • 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 2Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
  • 3Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
  • 4Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA

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Phys. Rev. D 109, 035021 – Published 27 February, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.035021

Abstract

The Top Yukawa coupling profoundly influences several core mysteries linked to the electroweak scale and the Higgs boson. We study the feasibility of measuring the Top Yukawa coupling at high energy muon colliders by examining the high energy dynamics of the weak boson fusion to top quark pair processes. A deviation of the Top Yukawa coupling from the Standard Model would lead to a modified VV→tt¯ process, violating unitarity at high energy. Our analysis reveals that utilizing a muon collider with a center-of-mass energy of 10 TeV and an integrated luminosity of 10  ab−1 allows us to investigate the Top Yukawa coupling with a precision surpassing 1.5%, more than one order of magnitude better than the precision from tt¯h channel at muon colliders. This precision represents a notable enhancement compared to the anticipated sensitivities of the High-Luminosity LHC (3.4%) and those at muon colliders derived from the tt¯H process.

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Phys. Rev. D 109, 035021– Published 27 February, 2024
  • Received 27 September 2023
  • Accepted 26 January 2024
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