8,612 research outputs found

    Unified TeV Scale Picture of Baryogenesis and Dark Matter

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    We present a simple extension of MSSM which provides a unified picture of cosmological baryon asymmetry and dark matter. Our model introduces a gauge singlet field NN and a color triplet field XX which couple to the right--handed quark fields. The out--of equilibrium decay of the Majorana fermion NN mediated by the exchange of the scalar field XX generates adequate baryon asymmetry for MN∼100M_N \sim 100 GeV and MX∼M_X \sim TeV. The scalar partner of NN (denoted N~1\tilde{N}_1) is naturally the lightest SUSY particle as it has no gauge interactions and plays the role of dark matter. N~1\tilde{N}_1 annihilates into quarks efficiently in the early universe via the exchange of the fermionic X~\tilde{X} field. The model is experimentally testable in (i) neutron--antineutron oscillations with a transition time estimated to be around 101010^{10} sec, (ii) discovery of colored particles XX at LHC with mass of order TeV, and (iii) direct dark matter detection with a predicted cross section in the observable range.Comment: 10 pages, one reference updated. Version to appear in Phys. Rev. Let

    Quark-Lepton Quartification

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    We propose that quarks and leptons are interchangeable entities in the high-energy limit. This naturally results in the extension of [SU(3)]^3 trinification to [SU(3)]^4 quartification. In addition to the unbroken color SU(3)_q of quarks, there is now also a color SU(3)_l of leptons which reduces to an unbroken SU(2)_l. We discuss the natural occurrence of SU(2)_l doublets at the TeV energy scale, which leads remarkably to the unification of all gauge couplings without supersymmetry. Proton decay occurs through the exchange of scalar bosons, with a lifetime in the range 10^{34} - 10^{36} years.Comment: 12 pages, 4 figures. Reference adde
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