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A measurement of the Higgs boson Yukawa coupling to the top quark ispresented using proton-proton collision data at $\sqrt{s} =$ 13 TeV,corresponding to an integrated luminosity of 137 fb$^{-1}$, recorded with theCMS 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 ofthe $\mathrm{t\bar{t}}$ system and the rapidity difference of the top quark andantiquark are sensitive to the value of $Y_\mathrm{t}$. The measurement yieldsa 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.

physical review. d/physical review. d.

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