Measurement of the top quark Yukawa coupling from t(t)over-bar kinematic distributions in the lepton plus jets final state in proton-proton collisions at root s=13 TeV
Results are presented for an extraction of the top quark Yukawa coupling from top quark-antiquark (t¯t) kinematic distributions in the lepton plus jets final state in proton-proton collisions, based on data collected by the CMS experiment at the LHC at ffiffi s p ¼ 13 TeV, corresponding to an int...
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Main Authors: | , , , , , |
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Format: | Article |
Language: | English English English |
Published: |
American Physical Society
2019
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Subjects: | |
Online Access: | http://irep.iium.edu.my/79891/1/79891_Measurement%20of%20the%20top%20quark%20Yukawa%20coupling%20from%20t%C2%AFt_article.pdf http://irep.iium.edu.my/79891/2/79891_Measurement%20of%20the%20top%20quark%20Yukawa%20coupling%20from%20t%C2%AFt_scopus.pdf http://irep.iium.edu.my/79891/3/79891_Measurement%20of%20the%20top%20quark%20Yukawa%20coupling%20from%20t%C2%AFt_wos.pdf http://irep.iium.edu.my/79891/ https://journals.aps.org/prd/pdf/10.1103/PhysRevD.100.072007 |
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Summary: | Results are presented for an extraction of the top quark Yukawa coupling from top quark-antiquark (t¯t)
kinematic distributions in the lepton plus jets final state in proton-proton collisions, based on data collected
by the CMS experiment at the LHC at ffiffi
s p ¼ 13 TeV, corresponding to an integrated luminosity of
35.8 fb−1. Corrections from weak boson exchange, including Higgs bosons, between the top quarks can
produce large distortions of differential distributions near the energy threshold of t¯t production. Therefore,
precise measurements of these distributions are sensitive to the Yukawa coupling. Top quark events are
reconstructed with at least three jets in the final state, and a novel technique is introduced to reconstruct the
t¯t system for events with one missing jet. This technique enhances the experimental sensitivity in the low
invariant mass region, Mt¯t. The data yields in Mt¯t, the rapidity difference jyt − y¯tj, and the number of
reconstructed jets are compared with distributions representing different Yukawa couplings. These
comparisons are used to measure the ratio of the top quark Yukawa coupling to its standard model
predicted value to be 1.07þ0.34 −0.43 with an upper limit of 1.67 at the 95% confidence level. |
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