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      The Stueckelberg Z Prime at the LHC: Discovery Potential, Signature Spaces and Model Discrimination

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          Abstract

          An analysis is given of the capability of the LHC to detect narrow resonances using high luminosities and techniques for discriminating among models are discussed. The analysis is carried out with focus on the \(U(1)_X\) Abelian (Higgless) Stueckelberg extension of the Standard Model (StSM) gauge group which naturally leads to a very narrow \(Z'\) resonance. Comparison is made to another class of models, i.e., models based on the warped geometry which also lead to a narrow resonance via a massive graviton (\(G\)). Methods of distinguishing the StSM \(Z'\) from the massive graviton at the LHC are analyzed using the dilepton final state in the Drell-Yan process \(pp\to Z'\to l^+l^-\) and \(pp\to G \to l^+l^-\). It is shown that the signature spaces in the \(\sigma \cdot Br(l^+l^-) \)-resonance mass plane for the \(Z\) prime and for the massive graviton are distinct. The angular distributions in the dilepton C-M system are also analyzed and it is shown that these distributions lie high above the background and are distinguishable from each other. A remarkable result that emerges from the analysis is the observation that the StSM model with \(Z'\) widths even in the MeV and sub-MeV range for \(Z'\) masses extending in the TeV region can produce detectable cross section signals in the dilepton channel in the Drell-Yan process with luminosities accessible at the LHC. While the result is derived within the specific StSM class of models, the capability of the LHC to probe models with narrow resonances in this range may hold more generally.

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          An Alternative to Compactification

          Conventional wisdom states that Newton's force law implies only four non-compact dimensions. We demonstrate that this is not necessarily true in the presence of a non-factorizable background geometry. The specific example we study is a single 3-brane embedded in five dimensions. We show that even without a gap in the Kaluza-Klein spectrum, four-dimensional Newtonian and general relativistic gravity is reproduced to more than adequate precision.
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            Estimation of oblique electroweak corrections

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              Z-prime Gauge Bosons at the Tevatron

              We study the discovery potential of the Tevatron for a Z-prime gauge boson. We introduce a parametrization of the Z-prime signal which provides a convenient bridge between collider searches and specific Z-prime models. The cross section for p pbar -> Z-prime X -> l^+ l^- X depends primarily on the Z-prime mass and the Z-prime decay branching fraction into leptons times the average square coupling to up and down quarks. If the quark and lepton masses are generated as in the standard model, then the Z-prime bosons accessible at the Tevatron must couple to fermions proportionally to a linear combination of baryon and lepton numbers in order to avoid the limits on Z--Z-prime mixing. More generally, we present several families of U(1) extensions of the standard model that include as special cases many of the Z-prime models discussed in the literature. Typically, the CDF and D0 experiments are expected to probe Z-prime-fermion couplings down to 0.1 for Z-prime masses in the 500--800 GeV range, which in various models would substantially improve the limits set by the LEP experiments.
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                Author and article information

                Journal
                28 June 2006
                2006-06-30
                Article
                10.1088/1126-6708/2006/11/007
                hep-ph/0606294
                Custom metadata
                JHEP 0611:007,2006
                44 page, 14 figures
                hep-ph hep-ex hep-th

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