Higgs pair production in association with a vector boson at e+e− colliders in theories of higher dimensional gravity
نویسندگان
چکیده
The models of large extra compact dimensions, as suggested by Arkani-Hamed, Dimopoulos and Dvali, predict exciting phenomenological consequences with gravitational interactions becoming strong at the TeV scale. Such theories can be tested at the existing and future colliders. In this paper, we study the contribution of virtual KaluzaKlein excitations (both spin-0 and 2) in the process e+e− → HHZ and e+e− → HHγ at future linear collider (NLC). We find that the virtual exchange KK gravitons can modify the cross-section σ(e+e− → HHZ) significantly from its Standard Model value and will allow the effective string scale to be probed up to 6.6 TeV. The second process is absent at the tree level in the standard model, and can therefore be used to put limits on the effective string scale of 7.4 TeV. email: [email protected] email: [email protected]
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Higgs production in association with top quark pair at e+e− colliders in theories of higher dimensional gravity
The models of large extra compact dimensions, as suggested by Arkani-Hamed, Dimopoulos and Dvali, predict exciting phenomenological consequences with gravitational interactions becoming strong at the TeV scale. Such theories can be tested at the existing and future colliders. In this paper, we study the contribution of virtual KaluzaKlein excitations in the process e+e− → tt̄H at future linear c...
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