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 ttbar final states containing ee, μμ, or eμ pairs. Variations of the Yukawa coupling strength lead to modified distributions for ttbar production. In particular, the distributions of the mass of the ttbar 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=1.16-0.35+0.24, bounding Yt<1.54 at a 95% confidence level.
Measurement of the top quark Yukawa coupling from t-tbar kinematic distributions in the dilepton final state in proton-proton collisions at √s=13 TeV
Amapane N.;Argiro S.;Bellan R.;Cappati A.;Costa M.;Covarelli R.;Kiani B.;Migliore E.;Monaco V.;Monteil E.;Obertino M. M.;Pacher L.;Pinna Angioni G. L.;Salvatico R.;Siviero F.;Sola V.;Solano A.;Soldi D.;Shchelina K.;Rumerio P.;Ravera F.;
2020-01-01
Abstract
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 ttbar final states containing ee, μμ, or eμ pairs. Variations of the Yukawa coupling strength lead to modified distributions for ttbar production. In particular, the distributions of the mass of the ttbar 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=1.16-0.35+0.24, bounding Yt<1.54 at a 95% confidence level.File | Dimensione | Formato | |
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