The Triple Higgs Boson Self-Coupling at Future Linear e^+e^- Colliders Energies : ILC and CLIC(Physics of elementary particles and fields)

概要

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We analyzed the triple Higgs boson self-coupling at future e^+e^- colliders energies, with the reactions e^+e^-→bb^^-HH, tt^^-HH. We evaluate the total cross-sections for both bb^^-HH and tt^^-HH, and calculate the total number of events considering the complete set of Feynman diagrams at tree-level. We vary the triple coupling κλ_<3H> within the range κ=-1 and +2. The numerical computation is done for the energies expected to be available at a possible Future Linear e^+e^- Collider with a center-of-mass energy 800, 1000, 1500GeV and a luminosity 1000fb^<-1>. Our analysis is also extended to a center-of-mass energy 3TeV and luminosities of 1000 and 5000fb^<-1>. We found that for the process e^+e^- → bb^^-HH, the complete calculation differs only by 3% from the approximate calculation e^+e^- → ZHH (Z→bb^^-), while for the process e^+e^- tt^^-HH, the expected number of events, considering the decay products of both t and H, is not enough to obtain an accurate determination of the triple Higgs boson self-coupling.
2008-09-15