e+ e- -> t anti-t H including decays: on the size of background contributions

Abstract

We present results for the lowest order cross sections, calculated with the complete set of the standard model Feynman diagrams, of all possible detection channels of the associated production of the top quark pair and the light Higgs boson, which may be used for determination of the top-Higgs Yukawa coupling at the future e+e- linear collider. We show that, for typical particle identification cuts, the background contributions are large. In particular, the QCD background contributions are much bigger than could be expected when taking into account a possibly low virtuality of exchanged gluons. Moreover, we include the initial state radiation effects and discuss the dependence of the cross sections on the Higgs boson and top quark masses.

13 pages, 1 figure; substantially revised version, accepted for publication in Eur.Phys.J.C

References in corpus (5)

• WHIZARD: Simulating Multi-Particle Processes at LHC and ILC
• ILC Reference Design Report Volume 1 - Executive Summary
• 'carlomat', A program for automatic computation of lowest order cross sections
• Off resonance background effects in e+e- -> t anti-t H
• Top quark couplings at ILC: six and eight fermion final states

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• Top Yukawa coupling measurement with indefinite CP Higgs in $e^{+}{e}^{-}\to t\bar{t}\Phi$
• Probing the top-Higgs coupling through the secondary lepton distributions in the associated production of the top-quark pair and Higgs boson at the LHC