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

Abstract

A measurement of the Higgs boson Yukawa coupling to the top quark is presented using proton-proton collision data at s\sqrt{s}=13  TeV, corresponding to an integrated luminosity of 137  fb1^{-1}, recorded with the CMS detector. The coupling strength with respect to the standard model value, Yt_{t}, is determined from kinematic distributions in tt̅ final states containing ee, μμ, or eμ pairs. Variations of the Yukawa coupling strength lead to modified distributions for tt̅ production. In particular, the distributions of the mass of the tt̅ system and the rapidity difference of the top quark and antiquark are sensitive to the value of Yt_{t}. The measurement yields a best fit value of Yt_{t}=1.16+0.24−0.35, bounding Yt_{t}<1.54 at a 95% confidence level

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