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Measurement of the top quark Yukawa coupling from tt¯ kinematic distributions in the dilepton final state in proton-proton collisions at √s = 13 TeV

A measurement of the Higgs boson Yukawa coupling to the top quark is presented using proton-proton collision data at 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, Yt, is determined from kinematic distributions in tt¯ final states containing ee, μμ, or eμ pairs. Variations of the Yukawa coupling strength lead to modified distributions for tt¯ production. In particular, the distributions of the mass of the tt¯ system and the rapidity difference of the top quark and antiquark are sensitive to the value of Yt. The measurement yields a best fit value of Yt= 1.16 +0.24−0.35, bounding Yt < 1.54 at a 95% confidence level.

High energy physics ; Experimental particle physics ; LHC ; CMS ; Particle Physics Experiments

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