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      Search for Compositeness, Leptoquarks and Large Extra Dimensions in eq Contact Interactions at HERA

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          Abstract

          The reaction e+p --> e+X is studied with the H1 detector at Hera. The data cover momentum transfers Q^2 between 200 GeV^2 and 30,000 GeV^2 and correspond to an integrated luminosity of 35.6 pb^(-1). The differential cross section dsigma/dQ^2 is compared to the Standard Model expectation for neutral current scattering and analysed to search for bar(e)e bar(q)q contact interactions. No evidence for new phenomena is observed. The results are used to set limits on scales within models of electron--quark compositeness, quark form factors and the exchange of virtual heavy leptoquarks. A search for gravitational effects mediated through the exchange of virtual gravitons which propagate into large extra dimensions is presented.

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          New Tests for Quark and Lepton Substructure

          Estia J. Eichten, Kenneth D. Lane, Michael E. Peskin (1983)
          Article 0 comments Cited 254 times – based on 0 reviews     Review now
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            Parton distributions: a new global analysis

            R. S. Thorne, W. Stirling, R G Roberts … (1998)
            We present a new analysis of parton distributions of the proton. This incorporates a wide range of new data, an improved treatment of heavy flavours and a re-examination of prompt photon production. The new set (MRST) shows systematic differences from previous sets of partons which can be identified with particular features of the new data and with improvements in the analysis. We also investigate the sensitivities of the results to (i) the uncertainty in the determination of the gluon at large x, (ii) the value of alpha_S(M_Z^2) and (iii) the minimum Q^2 cut on the data that are included in the global fit.
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              Using Scalars to Probe Theories of Low Scale Quantum Gravity

              Thomas G. Rizzo (1999)
              Arkani-Hamed, Dimopoulos and Dvali have recently suggested that gravity may become strong at energies near 1 TeV which would remove the hierarchy problem. Such a scenario can be tested at present and future colliders since the exchange of towers of Kaluza-Klein gravitons leads to a set of new dimension-8 operators that can play important phenomenological roles. In this paper we examine how the production of pairs of scalars at \(e^+e^-\), \(\gamma \gamma\) and hadron colliders can be used to further probe the effects of graviton tower exchange. In particular we examine the tree-level production of pairs of identical Higgs fields which occurs only at the loop level in both the Standard Model and its extension to the Minimal Supersymmetric Standard Model. Cross sections for such processes are found to be potentially large at the LHC and the next generation of linear colliders. For the \(\gamma\gamma\) case the role of polarization in improving sensitivity to graviton exchange is emphasized.
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                Author and article information

                Journal
                Publication date Created: 02 March 2000
                Publication date Updated: 2000-03-17
                Article
                DOI: 10.1016/S0370-2693(00)00332-4
                ArXiV ID: hep-ex/0003002
                SO-VID: 98fd6e2e-e575-49c0-aecc-10497262b7f3
                History
                Custom metadata
                Report No DESY 00-027
                Journal reference Phys.Lett.B479:358-370,2000
                Comments 21 pages, 6 figures, 2 tables, Update to references
                Categories hep-ex

                Data availability:

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