Abstract
The recent up to ∼2 fb−1 of data from the ATLAS and CMS experiments at the CERN Large Hadron Collider at 7 TeV put an upper bound on the production cross section of a Higgs-like particle. We translate the results of the H→WW→lνlν and H→γγ as well as the combined analysis by the ATLAS and CMS into an allowed region for the Kaluza–Klein (KK) mass MKK and the Higgs mass MH for all the known Universal Extra Dimension (UED) models in five and six dimensions. Our bound is insensitive to the detailed KK mass splitting and mixing and hence complementary to all other known signatures.
Highlights
The ATLAS and CMS experiments at the CERN Large Hadron Collider (LHC) have presented their latest results for the 2 fb−1 of data at the center of mass energy 7 TeV at the XXV International Symposium on Lepton Photon Interactions at High Energies (Lepton Photon 11), Mumbai, India, 22–27 August 2011
The enhancement of Higgs production cross section overcomes the suppression of the di-photon branching ratio in the H → γγ excluded range, whereas the region for smaller MKK is not excluded because of the suppression of the di-phton branching ratio. (For example, in the case of S2 Universal Extra Dimension (UED), the di-photon cross section is suppressed for MKK 400 GeV.) We find that all the suppressed region is already excluded by W W channel
The Standard Model is still allowed in this range whereas we find that all the UED models below MKK = 1.4 TeV is excluded
Summary
The ATLAS and CMS experiments at the CERN Large Hadron Collider (LHC) have presented their latest results for the 2 fb−1 of data at the center of mass energy 7 TeV at the XXV International Symposium on Lepton Photon Interactions at High Energies (Lepton Photon 11), Mumbai, India, 22–27 August 2011. In this Letter, we translate the above constraint on the production cross section into that on the Kaluza-Klein (KK) scale of various 5-Dimensional (5D) and 6D Universal Extra Dimension (UED) models, namely the minimal UED (mUED) [3] and the Dirichlet Higgs (DH) [4, 5] models in 5D and the 6D UED models on T 2/Z2 [3], T 2/Z4 [6, 7], T 2/(Z2 × Z2) [8], RP 2 [9], S2/Z2 [10], Projective Sphere (PS) [11], and S2 [12].1. We bound the UED parameter space of MKK (first-level KK mass) and MH (zero mode Higgs mass) based on the leading ATLAS and CMS constraints on the total cross section and on that of each channel [1, 2] In this Letter, we translate the above constraint on the production cross section into that on the Kaluza-Klein (KK) scale of various 5-Dimensional (5D) and 6D Universal Extra Dimension (UED) models, namely the minimal UED (mUED) [3] and the Dirichlet Higgs (DH) [4, 5] models in 5D and the 6D UED models on T 2/Z2 [3], T 2/Z4 [6, 7], T 2/(Z2 × Z2) [8], RP 2 [9], S2/Z2 [10], Projective Sphere (PS) [11], and S2 [12].1 Concretely, we bound the UED parameter space of MKK (first-level KK mass) and MH (zero mode Higgs mass) based on the leading ATLAS and CMS constraints on the total cross section and on that of each channel [1, 2]
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