Top Yukawa Coupling Determination at High Energy Muon Collider

TL;DR

This paper demonstrates that a 10 TeV muon collider with high luminosity can measure the Top Yukawa coupling with over 1.5% precision, significantly surpassing current collider sensitivities.

Contribution

It introduces a novel method using high-energy weak boson fusion processes at muon colliders to precisely determine the Top Yukawa coupling.

Findings

Achieves over 1.5% precision in Top Yukawa coupling measurement.

Surpasses the sensitivity of $t\bar{t}h$ channel at muon colliders.

Outperforms HL-LHC in Top Yukawa coupling precision.

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 modified $V V \rightarrow t\bar{t}$ 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 $t\bar t h$ 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 $t\bar{t} H$ process.