Higgs pair production in the standard model at next generation lineare+e−colliders

Abstract

We study the Higgs pair production in the standard model of strong and electroweak interactions at future e ϩ e Ϫ collider energies, with the reaction e ϩ e Ϫ →t tHH. We evaluate the total cross section of t tHH and calculate the total number of events considering the complete set of Feynman diagrams at the tree level. The numerical computation is done for an energy which is expected to be available at a possible Next Linear e ϩ e Ϫ Collider with a center-of-mass energy 800, 1600 GeV and a luminosity of 1000 fb Ϫ1 .

Associated production ofH±andW∓in high-energyLogan1, Su2 2002Phys. Rev. D342230View full textAdd to dashboardCite

“…10). At a 1000 GeV LC,tbH + production is more promising, due to the larger phase space available; it yields ≥ 10 events at large tan β ∼ 40 for m H ± < ∼ 550 GeV, while τ −ν H + production gives a reach of only m H ± < ∼ 520 GeV [23,25] (see Fig. 11).…”

“…10. 11 The process e + e − → bbA 0 yields less than 20 events for m A 0 > 250 GeV [23,24]. At a 1000 GeV LC, neither bbH 0 nor bbA 0 production yields more than 10 events for m H 0 ,A 0 > 500 GeV [23].…”

“…11 The process e + e − → bbA 0 yields less than 20 events for m A 0 > 250 GeV [23,24]. At a 1000 GeV LC, neither bbH 0 nor bbA 0 production yields more than 10 events for m H 0 ,A 0 > 500 GeV [23]. At a 500 GeV LC, both τ −ν H + andtbH + production yield ≥ 10 events at large tan β ∼ 40 for m H ± < ∼ 270 GeV, with τ −ν H + production having a slightly larger cross section [23,25,26] (see Fig.…”

“…[23,24] corresponds to roughly 20 signal events after QCD corrections are included. 12 The QCD corrections to e + e − →tbH + were recently computed in Ref.…”

“…If the MSSM constraint on the Higgs 11 Results were given in Refs. [23,24] for tree-level e + e − → bbH 0 , bbA 0 cross sections down to 0.1 fb, which yields 50 signal events, using m b = 4.25 GeV. We take into account the dominant QCD corrections [54] by scaling these cross sections by…”