TheZ′ reconsidered

Ferroglia, Andrea; Lorca, A.; Bij, J.J. van der

doi:10.1002/andp.200710249

Cited by 34 publications

(53 citation statements)

References 27 publications

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“…Similar phenomena regarding a narrow resonance are seen in other classes of models such as those based on universal extra dimensions [6], models with a shadow sector [7][8][9], and in the models considered in Ref. [10]. The possibility of a narrow graviton resonance also arises in the RS model [11,12].…”

Section: Introductionsupporting

confidence: 70%

StueckelbergZ′extension with kinetic mixing and millicharged dark matter from the hidden sector

2007

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An analysis is given of the Stueckelberg extension of the standard model with a hidden sector gauge group U1 X where the mass growth for the extra gauge boson occurs via the Stueckelberg mechanism, and where the kinetic mixing in the U1 X U1 Y sector is included. Such a kinetic mixing is generic in a broad class of supergravity and string models. We carry out a detailed global fit of the model with the precision CERN LEP data on and off the Z pole, with 2 within 1% of the 2 of the standard model fit. Further, it is shown that, in the absence of matter in the hidden sector, there is a single effective parameter that controls the deviations from the standard model predictions, and the dependence on the kinetic mixing emerges only when matter in the hidden sector is included. An analysis is also given of millicharged dark matter arising from the hidden sector, where it is shown that such dark matter from the Stueckelberg extension can satisfy WMAP-3 data while allowing for a sharp Z 0 resonance which can be detected at the Tevatron and at the CERN LHC via a dilepton signal generated by the Drell-Yan process.

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Section: Introductionsupporting

confidence: 70%

StueckelbergZ′extension with kinetic mixing and millicharged dark matter from the hidden sector

2007

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“…It is somewhat ironic, that this type of model was not discussed already in the 1960's, when the Higgs particle was introduced, as in this period much research was done on dispersion relations, which is a subject closely related to the Källén-Lehmann spectral density. Besides in the Higgs sector the idea of mixing a four-dimensional field with a high dimensional singlet in a renormalizable way works also for (abelian) vector-fields [17][18][19] or for right-handed neutrinos. Necessary is that the four-dimensional fields are singlets under the gauge group; otherwise renormalizability is lost.…”

Section: Discussionmentioning

confidence: 99%

New spectra in the HEIDI Higgs models

Bij

Puliçe

2011

Nuclear Physics B

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We study the so-called HEIDI models, which are renormalizable extensions of the standard model with a higher dimensional scalar singlet field. As an additional parameter we consider a higher-dimensional mixing mass parameter. This leads to enriched possibilities compared to a previous study. We find effective spectral densities of the Higgs propagator, consisting of one, two or no particle peaks, together with a continuum. We compare with the LEP-2 data and determine for which range of the model parameters the data can be described. Assuming two peaks to be present we find for the new mass scale ν ≈ 56 ± 12 GeV, largely independent of the dimension. In the limiting case of d → 6 and two peaks we find a higher dimensional coupling constant α 6 = 0.70 ± 0.18, indicative of strong interactions among the higher dimensional fields. The LHC will not be able to study this Higgs field.

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“…The general class of models we are going to study is the one defined by the so-called nonexotic minimal Z models [21,22,23,24,25,26]. Following the convention of Ref.…”

Section: The Minimal Z Modelmentioning

confidence: 99%

“…As any other parameter in the Lagrangian, g and g 1 are running parameters [22,24,25,27], therefore their values ought to be defined at some scale. A discrete set of popular Z models (see, e.g., Refs.…”

Section: The Minimal Z Modelmentioning

confidence: 99%

Non-exotic Z′ signals in ℓ + ℓ −, $ b\overline{b} $ and $ t\overline{t} $ final states at the LHC

Basso

Mimasu

Moretti

2012

J. High Energ. Phys.

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In the attempt to fully profile a Z boson accessible at the Large Hadron Collider (LHC), we study the sensitivity of di-lepton (for the electron, muon and tauon cases) and di-quark (for the case of the heavy flavours, t and, possibly, b) samples to the nature of the new gauge state, for a one-dimensional class of non-exotic Z bosons. Assuming realistic final state reconstruction efficiencies and error estimates, we find that, depending on the CERN collider energy and luminosity, the best chances of extracting the Z quantum numbers occur when two or more of these channels are simultaneously explored, as none of them separately enables one to fully probe the parameter spaces of the aforementioned models. Effects of Standard Model (SM) background as well interferences between this and the various Z signals have been accounted for. A complete study of cross sections and asymmetries (both spatial and spin ones) makes clear the need for complementarity, especially for their disentanglement over the full parameter space.

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TheZ′ reconsidered

Cited by 34 publications

References 27 publications

StueckelbergZ′extension with kinetic mixing and millicharged dark matter from the hidden sector

StueckelbergZ′extension with kinetic mixing and millicharged dark matter from the hidden sector

New spectra in the HEIDI Higgs models

Non-exotic Z′ signals in ℓ + ℓ −, $ b\overline{b} $ and $ t\overline{t} $ final states at the LHC

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