8,612 research outputs found
Unified TeV Scale Picture of Baryogenesis and Dark Matter
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 and a color triplet field which couple to the
right--handed quark fields. The out--of equilibrium decay of the Majorana
fermion mediated by the exchange of the scalar field generates adequate
baryon asymmetry for GeV and TeV. The scalar partner
of (denoted ) is naturally the lightest SUSY particle as it
has no gauge interactions and plays the role of dark matter.
annihilates into quarks efficiently in the early universe via the exchange of
the fermionic field. The model is experimentally testable in (i)
neutron--antineutron oscillations with a transition time estimated to be around
sec, (ii) discovery of colored particles 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
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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