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CMS Physics Analysis Summaries
Report number	CMS-PAS-TOP-17-004
Title	Constraining the top quark Yukawa coupling from $\text{t}\bar{\text{t}}$ differential cross sections in the lepton+jets final state in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$
Corporate author(s)	CMS Collaboration
Collaboration	CMS Collaboration
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	A measurement of the top quark Yukawa coupling from the top quark-antiquark ($\text{t}\bar{\text{t}}$) differential production cross sections in proton-proton collisions with the lepton+jets channel is presented. Corrections due to electroweak bosons exchange, including the Higgs boson, between the final state top quarks can produce large distortions of differential distributions near the energy threshold of top quark pair production. Therefore precise measurements of these distributions are sensitive to the Yukawa coupling. This analysis is based on data collected by the CMS experiment at the LHC at $\sqrt{s}=13~\mathrm{TeV}$ corresponding to an integrated luminosity of $35.8~\mathrm{fb}^{-1}$. Top quark events are reconstructed with at least three jets in the final state. A novel technique is introduced to reconstruct the $\text{t}\bar{\text{t}}$ system for events with one missing jet. This technique enhances the experimental sensitivity in the low invariant mass region, $M_{\text{t}\bar{\text{t}}}$. The data yields in $M_{\text{t}\bar{\text{t}}}$, the rapidity difference $|y_\text{t}-y_{\bar{\text{t}}}|$, and the number of reconstructed jets are compared with distributions representing different Yukawa couplings. These comparisons are used to extract an upper limit on the top quark Yukawa coupling of 1.67 (1.62 expected) at $95\%$ confidence level.
Other source	Inspire
Related	superseded by: CERN-EP-2019-119, CERN-EP-2020-152
Email contact: cms-pag-conveners-top@cern.ch  Fulltext in PDF  Figure_009-d  Figure_007-e  Figure_007-d  Figure_007-g  Figure_009-c  Figure_008-b  Figure_008-c  Figure_009-e  Figure_008-a  Figure_008-f  Figure_008-g  Figure_008-d  Figure_008-e  Figure_007-a  Figure_008-h  Figure_011-a  Figure_011-b  Figure_011-c  Figure_011-d  Figure_007-c  Figure_010  Figure_007-b  Figure_009-b  Figure_002-a  Figure_003-a  Figure_003-c  Figure_003-b  Figure_006-f  Figure_009-f  Figure_005-h  Figure_004-b  Figure_007-h  Figure_004-a  Figure_005-c  Figure_005-b  Figure_005-a  Figure_007-f  Figure_005-g  Figure_005-f  Figure_005-e  Figure_005-d  Figure_009-a  Figure_006-a  Figure_006-b  Figure_006-c  Figure_006-d  Figure_006-e  Figure_002-b  Figure_006-g  Figure_006-h  Figure_001  Additional information for the analysis (restricted access)