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

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

2009-03-26

arxiv.org/abs/0903.4606v2

Eur.Phys.J.C64:645-651,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1140/epjc/s10052-009-1166-0

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.

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