Abstract
Results are presented for an extraction of the top quark Yukawa coupling from top quark-antiquark () 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 , corresponding to an integrated luminosity of . Corrections from weak boson exchange, including Higgs bosons, between the top quarks can produce large distortions of differential distributions near the energy threshold of 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 system for events with one missing jet. This technique enhances the experimental sensitivity in the low invariant mass region, . The data yields in , the rapidity difference , 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 with an upper limit of 1.67 at the 95% confidence level.
4 More- Received 2 July 2019
DOI:https://doi.org/10.1103/PhysRevD.100.072007
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
© 2019 CERN, for the CMS Collaboration