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

• Received 15 September 2020
• Accepted 9 October 2020

DOI:https://doi.org/10.1103/PhysRevD.102.092013

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