Abstract
We present a study of the expected precision for measurement of the top Yukawa coupling, yt, in e+e- collisions at a center-of-mass energy of 1 TeV and assuming a beam polarization of P (e-, e+) = (-0.8,+0.2). Independent analyses of ttH final states containing at least six hadronic jets are performed, based on detailed simulations of SiD and ILD, the two candidate detector concepts for the ILC. We estimate that a statistical precision of yt of 4% can be obtained with an integrated luminosity of 1 $\mathrm{ab}^{-1}$.
Highlights
The discovery of a standard model (SM)-like Higgs boson, announced on July 4, 2012 by the ATLAS and CMS CFor SiD a superconductiollaborations [1,2], was celebrated as a major milestone in particle physics
This is consistent with the findings of the study of the Higgs self-coupling in the six-jets final state of the ZHH channel [32, Chapter 2.5.2], where the confusion in the jet clustering was a dominant contribution to the mass resolution
The combination of results obtained for two different final states leads to a statistical uncertainty on the top Yukawa coupling of better than 4.5 % for an integrated luminosity of 0.5 ab−1 with the P(e−, e+) = (−80 %, +20 %) beam polarization configuration and 0.5 ab−1 with P(e−, e+) = (+80 %, −20 %) polarization
Summary
The discovery of a standard model (SM)-like Higgs boson, announced on July 4, 2012 by the ATLAS and CMS CFor SiD a superconductiollaborations [1,2], was celebrated as a major milestone in particle physics. A recent study of the prospects of measuring yt at the LHC [4] estimates that a precision of 14–15 % (7–10 %) is achievable with an integrated luminosity of 0.3 ab−1 (3 ab−1), including theoretical and systematic uncertainties. At s = 800 GeV [8,9], it is estimated that yt can be measured to a precision of 5–6 % for an integrated luminosity of 1 ab−1, including the systematic uncertainties due to the background normalization. The studies are carried out in ILD and SiD [11], the two detector concepts for the ILC They are performed with detailed detector simulations taking into account the main beam-induced backgrounds at the collider as well as the dominant background from other physics processes.
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