CMS-PAS-TOP-19-008

CMS-PAS-TOP-19-008
Measurement of the top quark Yukawa coupling from $\mathrm{t}\bar{\mathrm{t}}$ kinematic distributions in the dilepton final state at $\sqrt{s}=$ 13 TeV
CMS Collaboration
May 2020

Abstract: An indirect measurement of the Higgs Yukawa coupling to the top quark is presented using pp collision at $\sqrt{s}=$ 13 TeV with an integrated luminosity of 137 fb $^{-1}$ recorded by the CMS detector. The coupling strength with respect to the standard model value, $Y_\mathrm{t}$ , is determined from kinematic distributions in $\mathrm{t\bar{t}}$ production final states containing ee, $\mu\mu$ , or e $\mu$ pairs. Sensitivity to the Yukawa coupling originates from altered distributions of $\mathrm{t\bar{t}}$ production in the presence of virtual Higgs boson exchange. 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 $^{+0.24}_{-0.35}$ and a 95% confidence interval of $Y_\mathrm{t}\in[0,1.62]$ .
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, PRD 102 (2020) 092013. The superseded preliminary plots can be found here.

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