Kaluza - Klein Effects on Higgs Physics in Universal Extra Dimensions
نویسنده
چکیده
We examine the virtual effects of Kaluza-Klein (KK) states on Higgs physics in universal extra dimension models. We study the partial widths Γh→gg, Γh→γγ , and Γh→γZ , which are relevant for Higgs production and detection in future collider experiments. These interactions occur at one loop in the Standard Model, as do the KK contributions. We find that the deviations induced by the KK exchanges can be significant; for one extra dimension, the gg → h production rate is increased by 10% − 85% for the mass of the first KK state in the range 500 >∼ m1 >∼ 1500 GeV, a region untested by current direct search and precision measurement constraints. The h → γγ decay width is decreased by <∼ 20% in the same mass range. For two or more universal extra dimensions the results are cutoff dependent, and can only be qualitatively estimated. We comment on the detectability of these shifts at the LHC and at future e+e− and γγ colliders. ∗Work supported by the Department of Energy, Contract DE-AC03-76SF00515
منابع مشابه
Bounds on Kaluza-Klein excitations of the SM vector bosons from electroweak tests
Within a minimal extension of the SM in 4 + 1 dimensions, we study how Kaluza Klein excitations of the SM gauge bosons affect the electroweak precision observables. Asymmetries in Z decays provide the dominant bound on the compactification scale M of the extra dimension. If the higgs is so light that will be discovered at LEP2, we find the following 95%C.L. bounds: M > 3.5TeV (if the higgs live...
متن کاملIdentifying the contributions of Universal Extra Dimensions in the Higgs sector at linear e + e − colliders
We study the dilepton-dijet signal in the dominant Higgs production channel at a linear e+e− collider. We estimate the effects of Universal Extra Dimension (UED) by a simple analysis of the cross-sections. The heavy Kaluza-Klein excitations of the Standard Model fields in UED can significantly alter the decay properties of the Higgs boson to loop-driven final states. We show that by taking a si...
متن کاملSpinless photon dark matter from two universal extra dimensions
We explore the properties of dark matter in theories with two universal extra dimensions, where the lightest Kaluza-Klein state is a spin-0 neutral particle, representing a six-dimensional photon polarized along the extra dimensions. Annihilation of this ‘spinless photon’ proceeds predominantly through Higgs boson exchange, and is largely independent of other Kaluza-Klein particles. The measure...
متن کاملKaluza - Klein Reduction of the 5 - dimensional Stan - dard Model
We examine the virtual effects of Kaluza-Klein (KK) states on Higgs physics in universal extra dimension models. We study the partial widths Γh→gg, Γh→γγ , and Γh→γZ , which are relevant for Higgs production and detection in future collider experiments. These interactions occur at one loop in the Standard Model, as do the KK contributions. We find that the deviations induced by the KK exchanges...
متن کاملOne universal extra dimension in Pythia
The Universal Extra Dimensions model has been implemented in the PYTHIA generator from version 6.4.18 onwards, in its minimal formulation with one TeV sized extra dimension. The additional possibility of gravity-mediated decays, through a variable number of eV sized extra dimensions into which only gravity extends, is also available. The implementation covers the lowest lying Kaluza-Klein (KK) ...
متن کامل