Measurement of the top quark Yukawa coupling from $\mathrm{t\bar{t}}$ kinematic distributions in the dilepton final state in proton-proton collisions at $\sqrt{s} =$ 13 TeV

TL;DR

This paper measures the Higgs boson top quark Yukawa coupling using kinematic distributions in top-antitop events at 13 TeV, providing a precise estimate consistent with the Standard Model.

Contribution

It introduces a novel method to extract the top quark Yukawa coupling from $ ext{t}ar{ ext{t}}$ kinematic distributions in dilepton final states at 13 TeV.

Findings

Measured $Y_t$ = 1.16 with uncertainties

Bounded $Y_t$ at 95% confidence level

Demonstrated sensitivity of $ ext{t}ar{ ext{t}}$ distributions to Yukawa coupling

Abstract

A measurement of the Higgs boson Yukawa coupling to the top quark is presented using proton-proton collision data at $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 137 fb$^{-1}$, recorded with the CMS detector. The coupling strength with respect to the standard model value, $Y_\mathrm{t}$, is determined from kinematic distributions in $\mathrm{t\bar{t}}$ final states containing ee, $\mu\mu$, or e$\mu$ pairs. Variations of the Yukawa coupling strength lead to modified distributions for $\mathrm{t\bar{t}}$ production. In particular, the distributions of the mass of the $\mathrm{t\bar{t}}$ system and the rapidity difference of the top quark and antiquark are sensitive to the value of $Y_\mathrm{t}$. The measurement yields a best fit value of $Y_\mathrm{t} =$ 1.16 $^{+0.24}_{-0.35}$, bounding $Y_\mathrm{t}$ $\lt$ 1.54 at a 95% confidence level.