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

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 $\mathrm{t}\bar{\mathrm{t}}$ final states containing ee, $\mu \mu$, or e$\mu$ pairs. Variations of the Yukawa coupling strength lead to modified distributions for $\mathrm{t}\bar{\mathrm{t}}$ production. In particular, the distributions of the mass of the $\mathrm{t}\bar{\mathrm{t}}$ 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 ${}_{-0.35}^{+0.24}$, bounding $Y_{\mathrm{t}}$ $<$ 1.54 at a 95% confidence level.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-19-008 (CMS Public Pages). This version corrects Fig. 1

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